Complex sentence: Artur Gachinski, the 2010 Junior World bronze medalist, won the bronze medal, becoming the first men's skater to medal at his senior Worlds debut since Evan Lysacek had done so in 2005; both won a bronze medal in Moscow.
Split into simpler sentences: Artur Gachinski, the 2010 Junior World bronze medalist, took bronze in his first appearance at the senior event. He became the first men's skater to medal at his first senior Worlds since Evan Lysacek had done so in 2005; both won a bronze medal in Moscow.