Complex sentence: One last minute addition is American expatriate Sam Wilton who has overstayed his welcome as a plantation overseer by making love to the plantation owners wife where Sam and his lover's her husband are both wounded in a gunfight.
Split into simpler sentences: One last minute addition is American expatriate Sam Wilton who has overstayed his welcome as a plantation overseer by making love to the plantation owner's wife. As a result, Sam and his lover's husband are both wounded in a gunfight.