在第n次出现字符之前拆分字符串

Question

所以我有一个字符串

s = '"Never you mind what it is!" the guard retorted. "What are you?"'

我想把它分成两个不同的引号

s1 = '"Never you mind what it is!" the guard retorted.'
s2 = '"What are you"'

需要在第3个'''之前分割字符串