Complex sentence: Thomas Percy was concerned for his patron, Henry Percy, 9th Earl of Northumberland, and the Lords Vaux, Montague, Monteagle and Stourton were also mentioned.
Split into simpler sentences: Thomas Percy was concerned for his patron, Henry Percy, 9th Earl of Northumberland. The Lords Vaux, Montague, Monteagle and Stourton were also mentioned.