Complex sentence: During his surveillance, Ross finds Mel and her boyfriend, and during the ensuing struggle to force the reluctant girl to return to her parents, Ross' gun is is fired, striking the protagonist Ross in the upper thigh.
Split into simpler sentences: During his surveillance, Ross finds Mel and her boyfriend. During a struggle that ensues with Ross seeks to force the reluctant runaway to return to her parents, Ross' gun is discharged, striking Ross in the upper thigh.