Complex sentence: Also he is writing a third dragon series with an unknown co-author called "Children of the Bard", the first of which is The Song of the Ovulum, and will come out in 2011.
Split into simpler sentences: Also he is writing a third dragon series called "Children of the Bard" with an unknown co-author. The first installment is called "The Song of the Ovulum", and will come out in 2011.