Complex sentence: McDougal is working with Team Jordan on an encyclopedia for the series to be published about a year after the release of A Memory of Light; the encyclopedia has been in the works for many years, and the contract for it was signed before Jordan's death.
Split into simpler sentences: McDougal is working with Team Jordan on an encyclopedia for the series to be published about a year after the release of A Memory of Light. The encyclopedia has been in the works for many years, and the contract for it was signed before Jordan's death.