Complex sentence: On August 11,1829, Brigadier General Charles Gratiot ordered Lee to Cockspur Island, Georgia; plans were to build a fort on the marshy island which would command the outlet of the Savannah River.
Split into simpler sentences: On August 11,1829, Brigadier General Charles Gratiot ordered Lee to Cockspur Island, Georgia. The plan was to build a fort on the marshy island which would command the outlet of the Savannah River.