Complex sentence: In 1906 he moved to Paris and became friends with Henri Matisse, Georges Braque, Fernand Léger, then in 1915 he was painted by his friend, Amedeo Modigliani.
Split into simpler sentences: In 1906 he moved to Paris and became friends with Henri Matisse, Georges Braque and Fernand Léger. Then in 1915 he was painted by his friend, Amedeo Modigliani.