Complex sentence: Those who were against the comic protested on religious grounds, saying As a born-again Christian, I just wanted to notify the writers of "Fetus-X" that the comic strip (is) very offensive.
Split into simpler sentences: Those who were against the comic protested on religious grounds. One said, As a born-again Christian, I just wanted to notify the writers of "Fetus-X" that the comic strip (is) very offensive.