Complex sentence: As a result of that battle the Confederate right flank and rear were exposed, and the remaining supply lines cut, and the Confederate defenders were reduced by over 10,000 men killed, wounded, taken prisoner or in flight.
Split into simpler sentences: As a result of that battle the Confederate right flank and rear were exposed. The remaining supply lines were cut and the Confederate defenders were reduced by over 10,000 men killed, wounded, taken prisoner or in flight.