Complex sentence: Around 8:00 am, another force appeared, and the redcoats left their breakfast to man their positions again; however the force turned out to be the vanguard of Lord Chelmsford's relief column.
Split into simpler sentences: Around 8:00 am, another force appeared, and the redcoats left their breakfast to man their positions again. However, the force turned out to be the vanguard of Lord Chelmsford's relief column.