Complex sentence: Dan Harris, born in 1979, is an American screenwriter and director best known for working with Michael Dougherty and Bryan Singer and whose writing credits include X2 (X-Men 2) and Superman Returns.
Split into simpler sentences: Dan Harris, born in 1979, is an American screenwriter and director. He is best known for working with Michael Dougherty and Bryan Singer and whose writing credits include X2 (X-Men 2) and Superman Returns.