Complex sentence: This maneuver of Khalid gave a decisive blow to Heraculius plan, since he wished not to engage his troops in an open battle with the Muslims, where the Muslims could use their light cavalry effectively.
Split into simpler sentences: This maneuver of Khalid gave a decisive blow to Heraculius plan. As he wished not to engage his troops in an open battle with the Muslims, where Muslims could use their light cavalry effectively.