Complex sentence: There, she served as field assistant to Clara Lee Tanner and Emil Haury in 1935 and 1939-1940, and published on petroglyphs and ceramics based on that field work.
Split into simpler sentences: There, she served as field assistant to Clara Lee Tanner and Emil Haury in 1935 and 1939-1940. She published on petroglyphs and ceramics based on that field work.