Complex sentence: He also worked as a technical illustrator for the Prosperity Comapny and later freelancing in that capacity, he eventually obtained teaching credentials and taught art in the East Syracuse-Minoa Central School District until he retired in the late 1970s.
Split into simpler sentences: He also worked as a technical illustrator for the Prosperity Comapny and later freelancing in that capacity. He eventually obtained teaching credentials and taught art in the East Syracuse-Minoa Central School District until he retired in the late 1970s.