Complex sentence: They have performed in the United States in Summer 2012 and they have become the first Nepali band/artist to have performed in Wembley Arena, UK on August 3,2013.
Split into simpler sentences: They have performed in the United States in Summer 2012 and they have become the First Nepali Band/Artist to have performed in Wembley Arena, U.K on 3 August 2013. Nepathya became the first Nepalese band to perform at Wembley Arena UK on August 3,2013.