Complex sentence: According to historian Zhores Medvedev, Stalin was highly suspicious of Zhemchuzhina, he thought that she negatively influenced Molotov and recommended Molotov to divorce her.
Split into simpler sentences: According to historian Zhores Medvedev, Stalin was highly suspicious of Zhemchuzhina. He thought that she negatively influenced Molotov, and he recommended Molotov to divorce her.