Complex sentence: In March 1986, Kelly formed Kelly/Varnell Landscape Architects with David Varnell, a classmate from the University of Georgia, where they had jointly published their senior thesis, a planning study for Washington, Georgia.
Split into simpler sentences: In March 1986, Kelly and David Varnell formed Kelly/Varnell Landscape Architects. The two had been classmates at the University of Georgia where they jointly published their senior thesis, a planning study for Washington, Georgia.