Complex sentence: Contrary to popular belief, his teeth did not leave marks in the equipment, as Retrievers are trained to carry birds without puncturing them, however he did have a golden tooth, due to his bat carrying duties.
Split into simpler sentences: Contrary to popular belief, his teeth did not leave marks in the equipment, as Retrievers are trained to carry birds without puncturing them. He did however have a golden tooth due to his bat carrying duties.