Complex sentence: The FIVB World Tour, a beach volleyball Grand Slam event, is presented at an inner-city site every year, while the Mellowpark in Köpenick is one of the biggest skate and BMX parks in Europe.
Split into simpler sentences: The FIVB World Tour has chosen an inner-city site to present a beach volleyball Grand Slam every year. The Mellowpark in Köpenick is one of the biggest skate and BMX parks in Europe.