Complex sentence: On the morning of June 7th Sheridan and his two cavalry divisions lead by Brigadiar Gernerals Alfred T. A. Torbert and David M. Gregg left Cold Harbour and headed North to follow the North river Anna hoping to then cross the river to strike the railroad.
Split into simpler sentences: On the morning of June 7, Sheridan and his two cavalry divisions, led by Brigadier Generals Alfred T. A. Torbert and David McM. Gregg, left Cold Harbor and headed north to follow the North Anna River, hoping to then cross the river to strike the railroad.