Complex sentence: On January 8,1828, Eliza Ridgely married John Carnan Ridgely (1790--1867), the son of Charles Carnan Ridgely of Hampton Mansion, who had served as Governor of the state of Maryland from 1815 to 1818.
Split into simpler sentences: On January 8,1828, Eliza Ridgely married John Carnan Ridgely (1790--1867). He was the son of Charles Carnan Ridgely of Hampton Mansion, and his father had served as Governor of the state of Maryland from 1815 to 1818.