somewhat (analogous to) the chinese system of writing in (difficulty) for non-native speakers to learn and (loosely based) on the chinese system of writing (the) japanese system of writing known as kanji. 请问怎么改啊? 谢谢了。
The sentence is long and has a lot of extra phrases. it was inversed here. The main subject is "the Japanese system of writing," so, we need a main verb, "is."
The sentence is long and has a lot of extra phrases. it was inversed here. The main subject is "the Japanese system of writing," so, we need a main verb, "is."