Complex sentence: In February 2016 he entered the top 10 players in the world under age 20 and a month later, he reached a FIDE rating of 2600 for the first time.
Split into simpler sentences: In February 2016 he entered the top 10 players in the World under age 20. In March 2016, he reached a FIDE rating of 2600 for the first time.