Complex sentence: In August 2014, Band-Maid released the maxi single "Ai to Jōnetsu no Matador"; in December 2015 they released their sophomore record "New Beginning".
Split into simpler sentences: In August 2014, Band-Maid released the maxi single "Ai to Jōnetsu no Matador". In December 2015 they released their sophomore record "New Beginning".