Complex sentence: Brighton is the home of the Brighton Jetty Classic, an Open Water Swim made up of the 1500 metre Brighton Jetty Classic Swim and the 400 metre Jetty Swim, aimed at first time open water swimmers.
Split into simpler sentences: Brighton is the home of the Brighton Jetty Classic. An Open Water Swim comprising of a 1500 metre Brighton Jetty Classic Swim, or the 400 metre Jetty Swim, aimed at first time open water swimmers.