Complex sentence: Bishop Athanasius of Alexandria wrote that Zenobia did not "hand over churches to the Jews to make them into synagogues"; although the queen was not a Christian, she understood the power of bishops in Christian communities.
Split into simpler sentences: Bishop Athanasius of Alexandria mentioned that Zenobia did not "hand over churches to the Jews to make them into synagogues". The queen was not a Christian, but she understood the power held by bishops in Christian communities.