Complex sentence: Frederick Hammersley (January 5,1919--May 31,2009) was a critically acclaimed American abstract painter whose participation in the landmark 1959 "Four Abstract Classicists" exhibit secured his place in art history.
Split into simpler sentences: Frederick Hammersley (January 5,1919--May 31,2009) was an American abstract painter. His participation in the 1959 "Four Abstract Classicists" exhibit secured his place in art history.