Complex sentence: After graduate school Mr Johnson spent four years, 2000 to 2004, as the gallery director for the University of Texas at Tyler during this time he taught art appreciation and computer foundation courses at Northeast Texas Community College in Mt.
Split into simpler sentences: After graduate school Mr Johnson spent four years 2000 to 2004 working as the gallery director for the University of Texas at Tyler. From 2000 to 2004 he taught computer and foundation courses at Northeast Texas Community College in Mt.