Complex sentence: King Ine of Wessex enriched the endowment of the community of monks established at Glastonbury and reputed to have directed that a stone church be built in 712, the foundations of which form the west end of the nave.
Split into simpler sentences: King Ine of Wessex enriched the endowment of the community of monks already established at Glastonbury. He is said to have directed that a stone church be built in 712, the foundations of which form the west end of the nave.