帮忙看一下，这句话，用连词怎么连起来

不改动的话不需要连词。
He took in the contest but he did so not because he wanted to win but because he like the challenge.

the reason he took in the contest is not that he wanted to win,but that he like the challenge

He took in the contest because he like the challenge,but not wanted to win.

He took in the contest not because he wanted to win but because he like the challenge

比赛用take part in (参加)会较好

take in 接受 比赛就很怪

He take part in the cotest for challenging ,but not for winning.

这会更好