Complex sentence: His first exhibition was in 1966 in the Tibor De Nagy Gallery in New York, and has since had over 80 solo exhibitions and has had his work included in over 200 group exhibitions.
Split into simpler sentences: His first exhibition was in 1966 in the Tibor De Nagy Gallery in New York. He has since had over 80 solo exhibitions, and his work has been included in over 200 group exhibitions.