Complex sentence: The entire Zulu army is later discovered by men of Lt. Vereker's troop of scouts, who chase a number of Zulu herdsmen, trying to hurry away their cattle, only to discover the main Zulu enemy force of thousands at the bottom of a valley.
Split into simpler sentences: The entire Zulu army is later discovered by men of Lt. Vereker's troop of scouts. Chasing a number of Zulu herdsmen trying to hurry away their cattle, they discover the main Zulu enemy force of thousands at the bottom of a valley.