Complex sentence: Wurtenburg spent several years refereeing for Yale's football team, and had a practice as an ear, nose and throat specialist in New Haven, Connecticut, from 1904 until at least 1920.
Split into simpler sentences: Wurtenburg spent several years refereeing for Yale's football team. He had a practice as an ear, nose and throat specialist in New Haven, Connecticut from 1904 until at least 1920.