Complex sentence: Gustav II Adolf decided to scout the field again before the final assault, but was spotted by the Poles, and targeted by infantry marksmen, who managed to wound him in the neck and an arm, dropping him from the horse.
Split into simpler sentences: Gustav II Adolf decided to scout the field again before the final assault but was spotted by the Poles. He was targeted by infantry marksmen, who managed to wound him in the neck and arm, dropping him from the horse.