Complex sentence: After an independently released debut single and a self-released EP, the band signed with Virgin EMI Records, who released debut album "Bad Blood" in March 2013; the album entered the UK Albums Chart at number one.
Split into simpler sentences: After an independently released debut single and a self-released EP, the band signed to Virgin Records. Their first studio album, "Bad Blood", was released in March 2013 and entered the UK Albums Chart at number one.