How-to: desperate need of help in partitioning an external disk drive

Some time ago, after installing PARALLELS, my external disk drive lost one of the two HFS+ partitions it had (465 GB total, 50% one and 50% the other).
Now, after having sent it to assistance, the technicians have recovered all possible data, with one issue: they have created a NTFS partition with all recovered data.
The external disk drive is now as shown on:
http://www.tyrexionibus.com/pictures/partition-diskutility.png
** WHAT'S THE MATTER ? **
I want to save the data contained in the first partition and partition the disk with two HFS+ partitions (60% and 40% of the disk space, particularly). In other words, I need to CONVERT (from NTFS to HFS+) and RESIZE (from 50% to 60%) the first partition and MAKE (40% of disk space) another HFS+ partition WITHOUT losing data.
Please note that I _DO NOT_ have sufficient disk space in my MacBook Pro's HDD to move all data from the external disk drive to it, create a new partition and then move all data to the new partition again.
How can I solve this issue?

I don't read Italian, but from the screen shot it appears that the first partition is not formated as NTFS. Am I missing something?
The safest thing to do would be to use a second external drive to back up everything while you are changing formats and partitions. I guess you create a new partition on half the disc, more all the data to the new partition, then modify the first partition; but that seems risky.

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