Complex sentence: Montacute was born in Donyatt in Somerset, the eldest son of William Montacute, 1st Earl of Salisbury and Catherine Grandison, and succeeded his father as earl in 1344.
Split into simpler sentences: Montacute was born in Donyatt in Somerset, the eldest son of William Montacute, 1st Earl of Salisbury and his wife Catherine Grandison. Montacute succeeded his father as earl in 1344.