Please help, this code is trashing the database

Question

I have the 'pleasure' of fixing a view that as you can see in poorly written, and it is in production.
This thing is dying in production is giving me ORA-03113: end-of-file on communication channel error, I did my research and it is a patch that the DBA needs to apply, but he is telling that he does not have time, anyway, if someone out there kindly look at this code and give me some hints of how I can fix this thing, If you look at the end of the code where I put the message 'here is the problem; it is with this thing is dying, It does not like that subquery, I put alias on the tables but still not working.
SELECT y.gtvsdax_internal_code, y.gtvsdax_internal_code_group,
spraddr_pidm, spriden_id, spriden_last_name, spriden_first_name,
spriden_mi, spraddr_atyp_code, stvatyp_desc, spraddr_street_line1,
spraddr_street_line2, spraddr_street_line3, spraddr_city,
spraddr_stat_code, stvstat_desc, spraddr_zip, spraddr_cnty_code,
stvcnty_desc, spraddr_natn_code, stvnatn_nation, spraddr_seqno,
spraddr_delivery_point, spraddr_correction_digit
FROM saturn.stvatyp, saturn.stvnatn, saturn.stvstat, saturn.stvcnty, saturn.spriden, saturn.spraddr x, general.gtvsdax y
WHERE y.gtvsdax_internal_code_group = 'CC_ADDRESS_SYVADDS'
AND x.spraddr_seqno =
(SELECT MAX (spraddr_seqno)
FROM spraddr a
WHERE a.spraddr_pidm = x.spraddr_pidm
AND a.spraddr_atyp_code = x.spraddr_atyp_code
AND a.spraddr_status_ind IS NULL
AND ( (a.spraddr_to_date IS NULL
AND a.spraddr_from_date IS NULL
OR ( a.spraddr_to_date IS NOT NULL
AND a.spraddr_from_date IS NOT NULL
AND TRUNC (SYSDATE) BETWEEN TRUNC (a.spraddr_from_date)
AND TRUNC (a.spraddr_to_date)
OR ( a.spraddr_from_date IS NOT NULL
AND a.spraddr_to_date IS NULL
AND TRUNC (SYSDATE) >= TRUNC (a.spraddr_from_date)
OR ( a.spraddr_from_date IS NULL
AND a.spraddr_to_date IS NOT NULL
AND TRUNC (SYSDATE) <= TRUNC (a.spraddr_to_date)
AND stvatyp_code(+) = x.spraddr_atyp_code
AND stvnatn_code(+) = x.spraddr_natn_code
AND stvstat_code(+) = x.spraddr_stat_code
AND stvcnty_code(+) = x.spraddr_cnty_code
AND spriden_pidm = x.spraddr_pidm
AND spriden_change_ind IS NULL
AND x.spraddr_status_ind IS NULL
AND ( (x.spraddr_to_date IS NULL AND x.spraddr_from_date IS NULL)
OR ( x.spraddr_to_date IS NOT NULL
AND x.spraddr_from_date IS NOT NULL
AND TRUNC (SYSDATE) BETWEEN TRUNC (x.spraddr_from_date)
AND TRUNC (x.spraddr_to_date)
OR ( x.spraddr_from_date IS NOT NULL
AND x.spraddr_to_date IS NULL
AND TRUNC (SYSDATE) >= TRUNC (x.spraddr_from_date)
OR ( x.spraddr_from_date IS NULL
AND x.spraddr_to_date IS NOT NULL
AND TRUNC (SYSDATE) <= TRUNC (x.spraddr_to_date)
here is the problem
AND ((y.gtvsdax_internal_code_seqno||y.gtvsdax_external_code,
x.spraddr_atyp_code
) =
(SELECT MIN (c.gtvsdax_internal_code_seqno
||c.gtvsdax_external_code
MIN (c.gtvsdax_external_code)
FROM saturn.spraddr m, general.gtvsdax c
WHERE c.gtvsdax_internal_code = y.gtvsdax_internal_code
AND c.gtvsdax_internal_code_group = y.gtvsdax_internal_code_group
AND m.spraddr_pidm = x.spraddr_pidm
AND m.spraddr_atyp_code = c.gtvsdax_external_code
AND m.spraddr_status_ind IS NULL)
AND ( (x.spraddr_to_date IS NULL
AND x.spraddr_from_date IS NULL
OR ( x.spraddr_to_date IS NOT NULL
AND x.spraddr_from_date IS NOT NULL
AND TRUNC (SYSDATE) BETWEEN TRUNC (x.spraddr_from_date)
AND TRUNC (x.spraddr_to_date)
OR ( x.spraddr_from_date IS NOT NULL
AND x.spraddr_to_date IS NULL
AND TRUNC (SYSDATE) >= TRUNC (x.spraddr_from_date)
OR ( x.spraddr_from_date IS NULL
AND x.spraddr_to_date IS NOT NULL
AND TRUNC (SYSDATE) <= TRUNC (x.spraddr_to_date)
))

Answer 1

Agreed on formatting the query nicely.
The bit that jumped out to my problem-spotting eye was
AND ( (a.spraddr_to_date IS NULL
   AND a.spraddr_from_date IS NULL
OR ( a.spraddr_to_date IS NOT NULL
   AND a.spraddr_from_date IS NOT NULL
   AND TRUNC (SYSDATE) BETWEEN TRUNC (a.spraddr_from_date)
   AND TRUNC (a.spraddr_to_date)
OR ( a.spraddr_from_date IS NOT NULL
AND a.spraddr_to_date IS NULL
AND TRUNC (SYSDATE) >= TRUNC (a.spraddr_from_date)
OR ( a.spraddr_from_date IS NULL
AND a.spraddr_to_date IS NOT NULL
AND TRUNC (SYSDATE) <= TRUNC (a.spraddr_to_date)
))which could be written as
AND trunc(sysdate) BETWEEN trunc(nvl(a.spraddr_from_date, sysdate))
                       AND trunc(nvl(a.spraddr_to_date, sysdate))Similarly with x.spraddr_from_date/to_date.