Complex sentence: The opening ceremony was originally scheduled to be held at the older and bigger Jalisco Stadium, but the organizing committee for the Games (COPAG) decided to switch the ceremony venue to Omnilife Stadium, because it has better infrastructure and technological capability to host the event.
Split into simpler sentences: The opening ceremony was originally scheduled to be held at the older and bigger Jalisco Stadium. However the organizing committee for the Games (COPAG) decided to switch it to Omnilife Stadium, because it has better infrastructure and technological capability to host the event.