Complex sentence: As the last competition of the season, Byun participated in the Triglav Trophy, he placed in first place after the short program, from which he got ratified his first triple-triple combination, triple toe-loop-triple toe-loop.
Split into simpler sentences: As the last competition of the season, Byun participated in the Triglav Trophy. In the short program, he placed first and got ratified his first triple-triple combination, triple toe-loop-triple toe-loop.