Complex sentence: The cycle will involve athletes leaving the park via Queen Mother's Gate, travelling through Wellington Arch, down Constitution Hill and on to Birdcage Walk in front of Buckingham Palace before returning to the park to complete the event with a four lap run around the Serpentine.
Split into simpler sentences: The cycle will involve athletes leaving the park via Queen Mother's Gate, travelling through Wellington Arch, down Constitution Hill and on to Birdcage Walk in front of Buckingham Palace. Athletes will return to the park to complete the event with a four lap run around the Serpentine.