Complex sentence: In late May, at the end of the dry season (Union is a desert island), a significant event is "the Maroon"-a celebration which is a day long affair beginning before dawn and lasting late into the night.
Split into simpler sentences: In late May, at the end of the dry season (Union is a desert island) a significant event is "the Maroon". The Maroon celebration is a day long affair, beginning before dawn, and lasting late into the night.