Complex sentence: Schapiro was born in Riga, Latvia (part of Imperial Russia at that time) into a prosperous family of Jewish traders which left at the time of the Russian Revolution when he was eight years old, and soon settled in England.
Split into simpler sentences: Schapiro was born in Riga, Latvia (then part of the Russian Empire) into a prosperous family of Jewish traders. They emigrated at the time of the Russian Revolution, when he was eight years old, and soon settled in England.