Complex sentence: Bishop Lawrence was the grandson of the notable abolishionist Amos Adams Lawrence and a member of the influential Boston Family, founded by his great-great-grandfather and American revolutionary Samuel Lawrence; his great-grandfather was the famed philanthropist Amos Lawrence.
Split into simpler sentences: Bishop Lawrence was the grandson of the notable abolishionist Amos Adams Lawrence and a member of the influential Boston Family, founded by his great-great-grandfather and American revolutionary, Samuel Lawrence. And his great-grandfather was the famed philanthropist Amos Lawrence.