Complex sentence: Hideyoshi immediately seized the advantage by securing the heights of Tennozan; his vanguard then manuevered to face the Akechi forces along the Enmoyji river.
Split into simpler sentences: Hideyoshi immediately seized the advantage by securing the heights of Tennozan. Hideyoshi's vanguard manuevered to face the Akechi forces along the Enmoyji river.