麻烦帮我看看我造的英文句子有没有语法错误

The chief of the student union with a charming appearance has a sharp mind and an incredible leadship [which] [brings] his [actions] together, and keeping the union in harmony [is just a piece of cake for him].

这样是没有语法错误了.[]里是我改过的.但是我不明白什么叫"gets his act together"?我擅自改成"brings"和"actions"因为我觉得你的意思是"把他的行动连接起来".但..是这意思么?

in harmony改成形容词较好，因为你用了个KEEP
你动词都用ING形式，好像又没的is 哦

- -||
leadship that getting his act together and keeping the union in harmony

keep sth in harmony完全没有错

1
that gets ...and keeps...这样正确
2
要么就是leadship getting his act together and keeping the union in harmony
动名词表示定语

Is this ONE sentence?
Too many problems. Try break it down to shorter sentences.