Complex sentence: Peter F. Donnelly (1939--March 28,2009) was an American Arts Patron, former Vice-Chairman of Americans for the Arts, co-founder of the Seattle Arts Commission and pivotal figure in the Seattle arts community for more than 45 years.
Split into simpler sentences: Peter F. Donnelly (died March 28,2009) was an American patron of the arts. He was a former Vice-Chairman of Americans for the Arts, a co-founder of the Seattle Arts Commission and a pivotal figure in the Seattle artistic community for more than 45 years.