Complex sentence: She was first introduced as a kit, Dawnkit, in "Outcast", and as an apprentice in "Long Shadows" she left ShadowClan for ThunderClan with her mother and littermates after it lost faith in StarClan, and helped to create the fake StarClan sign.
Split into simpler sentences: She was first introduced as a kit, Dawnkit, in "Outcast", and as an apprentice in "Long Shadows". She left ShadowClan for ThunderClan with her mother and littermates after it lost faith in StarClan, and helped to create the fake StarClan sign.