Complex sentence: Heneage Finch, 4th Earl of Aylesford (1751-1812), son of Heneage Finch, 3rd Earl of Aylesford, married Louisa Thynne, daughter of Thomas Thynne, 1st Marquis of Bath.
Split into simpler sentences: Heneage Finch, 4th Earl of Aylesford (1751-1812), son of Heneage Finch, 3rd Earl of Aylesford was a British peer. Finch married Louisa Thynne, daughter of Thomas Thynne, 1st Marquis of Bath.