Complex sentence: Arriving at a place called Phurdo, he saw a five coloured rainbow upon which were seated Buddha Amitabha, Avalokitesvara and Padmasambhava and declared that the place was as sacred as Potala mountain.
Split into simpler sentences: Arriving at a place called Phurdo, he saw a five coloured rainbow upon which were seated Buddha Amitabha, Avalokitesvara and Padmasambhava. He said that the place was as sacred as Potala mountain.