Complex sentence: Though he was met by much hostility and even violence from the pagans, he was considerably effective in convincing many to convert to Christianity which is largely attributed to the fact that he took the time to study their beliefs and language.
Split into simpler sentences: Though he was met with hostility from the pagans, he was considerably effective in convincing many to convert to Christianity. His effectiveness is largely attributed to the fact that he took the time to study their beliefs and language.