How do you say

He intends to start a healthier diet in three months.

..in Chinese?

他打算三个月后开始健康饮食。

tā dǎ suàn sān gè yuè hòu kāi shǐ jiàn kāng yǐn shí 。

How do you say "I bought a new sofa last week, which is very comfortable." in Chinese?