Complex sentence: The tramp proves to be a former doctor, known to fellow tramps as'The Doc', who abandoned his family twenty years previously to work in Africa, but returned to Paris to live rough, mainly under various bridges.
Split into simpler sentences: The tramp proves to be a former doctor, known to fellow tramps as'The Doc', who abandoned his family twenty years previously. He worked in Africa, but returned to Paris to live rough, mainly under various bridges.