Complex sentence: Muslim women are forbidden from marrying non-Muslim men according to Islamic law., this prohibition serves to preserve the Islamic faith from dilution and expand it, within societies which are patriarchal but multi-faith.
Split into simpler sentences: Muslim women are forbidden from marrying non-Muslim men according to Islamic law. According to some, this prohibition serves to preserve the Islamic faith from dilution and expand it, within societies which are patriarchal but multi-faith.