Complex sentence: He is best known for his 2015 single "Nasty Freestyle" which peaked at number nine on the US "Billboard" Hot 100 and number 3 on the iTunes Top 100 in May 2015.
Split into simpler sentences: He is best known for his 2015 single "Nasty Freestyle" which peaked at number nine on the US "Billboard" Hot 100. It peaked at number nine on the US "Billboard" Hot 100 in May 2015.