Complex sentence: He began teaching as Professor at the Royal Academy in 1939, and included among his pupils were many who went on to become leading British artists (including Sydney Humphreys (of the Aeolian Quartet), Clarence Myerscough and Rosemary Rapaport).
Split into simpler sentences: He began teaching as Professor at the Royal Academy in 1939. Included among his pupils, were many who went on to become leading British artists (including Sydney Humphreys (of the Aeolian Quartet), Clarence Myerscough and Rosemary Rapaport).