英语语法that后面跟完整句子是为什么peopleliveinaconditionthattheycannotsupportthemselvessufficientlyIthinkthatstudentscanmakefriendsbyjoiningasportteambecauseoffollowingreasons.这两个句子有什么区别是

　　英语语法that后面跟完整句子是为什么

　　peopleliveinaconditionthattheycannotsupportthemselvessufficiently

　　Ithinkthatstudentscanmakefriendsbyjoiningasportteambecauseoffollowingreasons.

　　这两个句子有什么区别是什么语法啊