Complex sentence: Hornberger worked eleven years on his debut novel, "MASH", which was rejected by many publishers before he contacted the famed sportswriter, W.C. Heinz, to help him revise it.
Split into simpler sentences: Hornberger worked eleven years on his debut novel, "MASH", which was rejected by many publishers. He worked with the famed sportswriter, W.C. Heinz, to help him revise it.