Complex sentence: Tickets for Rock in Rio became available for general sale on April 4,2013 and within two hours, the first day of the festival, in which Beyoncé was headlining, had sold out all 65,000 tickets.
Split into simpler sentences: Tickets for Rock in Rio became available for general sale on April 4,2013. Within two hours, the first day of the festival, in which Beyoncé is headlining, had sold out all 65,000 tickets.