YOU SAID:

I don't like this person because they talk too much

INTO JAPANESE

この人はしゃべりすぎるので好きではない

BACK INTO ENGLISH

I don't like this person because he talks too much.

INTO JAPANESE

この人はしゃべりすぎるので好きではない。

BACK INTO ENGLISH

I don't like this person because he talks too much.