Complex sentence: In July 2011, "CoMS" was renamed the "Etihad Stadium" sponsored by Etihad Airways who fought off competition from Ferrostaal and Aabar to gain the stadium naming rights.
Split into simpler sentences: In July 2011, the stadium was renamed the "Etihad Stadium" sponsored by Etihad Airways. It is believed Etihad Airways fought off competition from Ferrostaal and Aabar to gain stadium naming rights.