Complex sentence: In two Gospels (Matthew 13:54-58, Mark 6:1-6), his fellow townspeople got angry with him because they didn't trust him, as being one of them, to have the authority to preach in that way and to perform miracles.
Split into simpler sentences: In two Gospels (Matthew 13:54-58, Mark 6:1-6), his fellow townspeople got angry with him. Because he was one of them, they didn't trust him to have the authority to preach in that way and to perform miracles.