Translation:That aid comes mainly from Japan.
very often (this is one is an example) only one English word order is accepted out of more that are equally good, and it is kind of annoying that one has to focus not on learnign Indonesian but to learn the specific answers in English
I always prefer more literal translation when learning foreign languages because you can better learn the structure of the language that way (like below) so I like English translation that is in the same order as the original Indonesian sentence even if the English is a little unnatural. So I like your order better (your order is not unnatural by the way).
Bantuan itu terutama datang dari Jepang.
That aid mainly comes from Japan.