Complex sentence: The record was broken by Rihanna's "Where Have You Been", which garnered 4.9 million, and later by Justin Bieber's "Boyfriend" which amassed more than 8 million views in 24 hours.
Split into simpler sentences: The record was later broken by Rihanna's "Where Have You Been", which garnered 4.9 million. And later was broken by Justin Bieber's "Boyfriend" which amassed more than 8 million views in 24 hours.