Complex sentence: The peak of their power occurred when the Asgard donated their entire technological knowledge to Earth prior to their extinction; with this and some Ancient technology, the Tau'ri actually surpassed their precursors and defeated the Ori.
Split into simpler sentences: The peak of their power occurred when the Asgard donated their entire technological knowledge to Earth prior to their extinction. With this and some Ancient technology, the Tau'ri actually surpassed their precursors and defeated the Ori.