[johngossman]

I haven't found Japanese grammar to be particularly complex either...at least compared to English or French. It is different. The 80/20 Japanese Book was a great help, as was "English Grammar for Students of Japanese" (the title is confusing, but it really is for learning Japanese, not English).

You can get a sample of 80/20 here:

https://8020japanese.com/japanese-sentence-structure/

Pronunciation also isn't that hard (Kanto dialect, at least) compared to, say, French. The writing system is definitely the hardest part for me.