Complex sentence: For this reason, he secreted the various parts of the work throughout Moscow and the surrounding suburbs, in the care of trusted friends, and sometimes purportedly visiting them on social calls, but actually working on the manuscript in their homes.
Split into simpler sentences: For this reason, he secreted the various parts of the work throughout Moscow and the surrounding suburbs, in the care of trusted friends. Sometimes when he was purportedly visiting them on social calls he actually worked on the manuscript in their homes.