Complex sentence: Al-Baqir had a prominent lineage: both his paternal and maternal grandfathers, Hasan ibn Ali and Husayn ibn Ali, were Muhammad's grandsons and his mother, Fatima Umm Abd Allah, was a daughter of al-Hasan, the son of Ali.
Split into simpler sentences: Al-Baqir had a prominent lineage in that both his paternal and maternal grandfathers, Hasan ibn Ali and Husayn ibn Ali, were Muhammad's grandsons. His mother, Fatima Umm Abd Allah, was a daughter of al-Hasan, the son of Ali.