Complex sentence: A two-to three-page typewritten letter written by Spengler was found at the scene, which expressed Spengler's intent to ambush first responders but offered no motive for the shooting.
Split into simpler sentences: A two-tothree-page typewritten letter written by Spengler was found at the scene. It reflected Spengler's intent to ambush first responders, but offered no motive for the shooting.