Complex sentence: It was Handel's first comic opera which broke away from the Opera Seria tradition and was rejected by the Royal Academy of Music because of its frivolous nature with relatively few extended arias and more recitative.
Split into simpler sentences: It was Handel's first comic opera which broke away from the Opera Seria tradition. The Royal Academy of Music rejected the work because of its frivolous nature, with relatively few extended arias and more recitative.