Complex sentence: Seán is also related to Francis Joseph O'Meara (March 30,1853--1888) who was a notable Irish Impressionist artist and Dutch Tennis champion Fenny Ten boss.
Split into simpler sentences: Seán is also related to Francis Joseph O'Meara (March 30,1853--1888) who was a notable Irish Impressionist artist. He is also related to the Dutch Tennis champion Fenny Ten boss.