Complex sentence: Petar Stojanović is the youngest player to appear for the national team; he was 19 years, 1 month, and 11 days old at the time of his debut in November 2014.
Split into simpler sentences: Petar Stojanović is the youngest player to appear for the national team. He was 19 years, 1 month, and 11 days old at the time of his debut in November 2014.