Complex sentence: For the Prague Carnival of 1750 Gluck composed a new opera, "Ezio" (again set to one of Metastasio's works), and his "Ipermestra" was also performed in the same year.
Split into simpler sentences: For the Prague Carnival of 1750 Gluck composed a new opera, "Ezio" (again set to one of Metastasio's works). His "Ipermestra" was also performed in the same year.