Complex sentence: His collaboration with the poet Michael Symmons Roberts is continuing, and his second opera, based on the ancient Welsh tales of the Mabinogian, is expected to premiered by Welsh National Opera in 2006.
Split into simpler sentences: His collaboration with Symmons Roberts is continuing with his second opera, based on the ancient Welsh tales of the Mabinogian. This is expected to premiered by Welsh National Opera in 2006.