Complex sentence: Regardless, Primero tries to slay him to finish the fight, but upon seeing Ferdinand resigning himself to it and the crowd, moved by his gentle nature, wanting him to live, he refuses to kill him and leaves with dignity.
Split into simpler sentences: Regardless, Primero tries to slay him to finish the fight. Upon seeing Ferdinand resigning himself to it and the crowd while moved by his gentle nature of wanting him to live, he refuses to kill him and leaves with dignity.