Complex sentence: Other than the Kamen Rider Scouts' uniforms and Core Medals, there is a letter form Naoki which details how he and the Kamen Rider Scouts became fugitives with Teddy sacrificing himself so they would escape.
Split into simpler sentences: Other than the Kamen Rider Scouts' uniforms and Core Medals, there is a letter form Naoki. Naoki explains how he and the Kamen Rider Scouts became fugitives and Teddy sacrificed himself so they would escape.