Question

这句英文怎么改？

It is very convenient, it can effectively reduce people's burden and improve people's quality of life, which is very beneficial.
它是非常方便的，能够有效地减轻人们的负担并改善人们的生活质量，这是非常有利的。

Answer 1

it is very convenient that it can effectively reduce people's burden and improve people's quality of life, which is very beneficial.

改动的地方用黑体标出来了，如果用逗号的话就是一句话，一句话不能有两个主语，用that作为连接词就是复合句了。

追答

或者用and连接也可以，总之要用个恰当的连接词构成复合句。

Answer 2

把which改为it就可以