Complex sentence: In 1763 the French and Indian War ended in victory for the British Empire, and the Cherokee were punished for switching sides in 1758 by the loss of their lands east of the 80-degree west-longitude line.
Split into simpler sentences: In 1763 the French and Indian War ended with a complete victory for the British Empire. The Cherokee were punished for switching sides in 1758 by the loss of all of their lands east of the 80th longitude line.