Complex sentence: Abe rose to prominence after becoming Youth Olympic champion in 2014 and eventually winning the Tokyo Grand Slam later that year, at just 17-years-old, beating then-World Champion Masashi Ebinuma.
Split into simpler sentences: Abe rose to prominence after becoming Youth Olympic champion in 2014. He won the Tokyo Grand Slam later that year, at just 17-years-old, beating then-World Champion Masashi Ebinuma.