Sentence 1: In August 1927 , Mao ended his marriage with Yang ; and , in early 1928 , he began a relationship with He Zizhen .
Sentence 2: In August 1927 , Mao ended his marriage with Yang and started a relationship with He Zizhen in early 1928 .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?