Complex sentence: John Leveson-Gower, 1st Baron Gower PC (1675--1709) was the son of Sir William Leveson-Gower, 4th Baronet and his wife Jane Granville.
Split into simpler sentences: John Leveson-Gower, 1st Baron Gower PC (1675--1709) was a member of the Leveson-Gower family. He was the son of Sir William Leveson-Gower, 4th Baronet and his wife Jane Granville.