Complex sentence: In an alternate ending, Kamen Rider Gaim admits defeat instead, as while he prepares a powered up attack to use against Kamen Rider 1, he stops after realizing that the Shōwa Rider could attack him before he deploys it.
Split into simpler sentences: In an alternate ending, Kamen Rider Gaim admits defeat instead. While he prepares a powered up attack to use against Kamen Rider 1, he stops after realizing that Kamen Rider 1 could attack him before he deploys it.