Complex sentence: Space combat is a game type that involves playing in a space environment, this environment can include an action based game such as any of the Rouge Squadron games; or a strategy based game such as Microsoft's Abandonware Allegiance.
Split into simpler sentences: Space combat is a game type that involves playing in a space environment. This environment can include an action based game such as any of the games, or a strategy games such as Microsoft's Abandonware Allegiance.