两个完整的句子之间有however，可以用分号

I like you; however, I can't date you.

或者

I like you. However, I can't date you.

其实没有很大的区别

注意，和中文里的分号的用法完全不一样。它不能作为一个句子的结尾（看however在两个句子中大小写的区别）！