Complex sentence: He is the first male skater to represent Argentina in an ISU Championship, competing at the Four Continents Figure Skating Championships in 2015 and at the World Figure Skating Championships in 2016.
Split into simpler sentences: He is the first male skating representing Argentina in an ISU Championship. He became the first skater representing Argentina at the Four Continents Figure Skating Championships in 2015 and at the World Figure Skating Championships in 2016.