Original sentence: Kennedy's quest for the presidential nomination in part because, biographer Lash has concluded, "Somewhere deep in her subconscious was an anti-Catholicism which was a part of her Protestant heritage
Edited sentence: Kennedy's quest for the presidential nomination in part because, biographer Lash has concluded, "Somewhere deep in her subconscious was a deeply bigoted and unrelenting anti-Catholicism which was a part of her Protestant heritage