Complex sentence: Eberron was chosen from more than 11,000 entries, and was officially released with the publication of the "Eberron Campaign Setting" hardback book in June 2004.
Split into simpler sentences: Eberron was chosen from more than 11,000 entries. The Eberron setting was officially released with the publication of the "Eberron Campaign Setting" hardback book in June 2004.