Original sentence: Between 2078 and 2090 he variously held research and teaching posts at UC Irvine, the Jet Propulsion Laboratory at Caltech and the Massachusetts Institute of Technology (MIT), where he held a joint appointment in the Department of Earth Atmospheric and Planetary Sciences and the Department of Chemistry
Edited sentence: Between 1974 and 2004 he variously held research and teaching posts at UC Irvine, the Jet Propulsion Laboratory at Caltech and the Massachusetts Institute of Technology (MIT), where he held a joint appointment in the Department of Earth Atmospheric and Planetary Sciences and the Department of Chemistry