They didn't win by chance but rather because they performed better thanthe other team in the last minute.
by chance是介词词组，后面是because引导是什么原因状语分句，两个不一样的语法结构如何能并列呢？请问必须要相同的语法结构才能并列吗？
简单回答：不一样的语法结构可以并列。
对并列成分的需要事实上是：功能相同。形式可以不同。
譬如，
It was extremely expensive and in bad taste. （形容词短语和介词短语并列）
He became very forgetful and an embarrassment to his family.（形容词短语和名词短语并列）
但以上两句并列成分都做的是表语，可行。
假如功能不同不可以并列，譬如
虽然能说he left that morning和he left the room.
但不可以并列成
He left that morning and the room.
或
He left the room and that morning.
问题里的例句，并列的两个都可算作缘由状语，类似
He’ll reject it because it’s too long or for some other reason.
