帮我看下这句英语说得对么?关键是was是否该加,如果不该加,那应该怎么改呢?

1.was得用
as the genome sequencing of it was completed in 2000是状语从句
主语是the genome sequencing of it,谓语是 was completed
它的基因组测序是在2000年完成的.
2.it become应该是it becomes这个变得更重要.
3.Mouse is the model material后用句号.
4.不去句号,应该把it become改为which becomes
Mouse is the model material,which becomes more important as the genome sequencing of it was completed in 2000.

可以加的，因为后面是个从句

It has some problems. It becomes more important.

more改为so 我觉得是同级的比较应该用so...as。 of 后面是一个定语从句修饰sequencing