Complex sentence: He was privately tutored until his twelfth year and then entered Margaret Academy, near Pungoteague in Accomack County, before graduating from Washington College (now Washington and Lee University), in 1825.
Split into simpler sentences: He was privately tutored until his twelfth year and then entered Margaret Academy, near Pungoteague in Accomack County. He graduated from Washington College (now Washington and Lee University), in 1825.