Complex sentence: John Page (1744-1808) was the grandson of Rosewell's first owner, Mann Page (I), grew up there, and was a classmate of Thomas Jefferson at the College of William and Mary in nearby Williamsburg where he graduated in 1763.
Split into simpler sentences: John Page (1744-1808) was the grandson of Rosewell's first owner, Mann Page (I). He grew up there, and was a classmate of Thomas Jefferson at the College of William and Mary in nearby Williamsburg where he graduated in 1763.