Complex sentence: After the first episode, Gwen becomes the leader of the Jewel Riders at the Friendship Ring Ceremony where she is given sacred Sun Stone, which is the jewel of light, a powerful gem that creates colourful rainbow effects from the bright sun light.
Split into simpler sentences: After the first episode, Gwen becomes the leader of the Jewel Riders. This is the jewel of light, a powerful gem that creates colourful rainbow effects from the bright sun light.