Inclusions in coprolites from the Green River Formation are uncommon. This one not only has inclusions, but articulated fish vertebrae and other bones.
Small fish would tend to digest faster than larger fish. So why would the little fish remain relatively intact while the bones and scales from the larger fish are scattered throughout the coprolite? In order to keep track of things, let's call the larger fish (C) Charlie, and the small, articulated fish (A) Albert. Based on the size Charlie's scales, he would have been large enough to eat Albert. Fish tend to eat other fish whole. So if Charlie ate Albert and then Charlie was immediately eaten by George (the guy that made the coprolite), little Albert would have been protected in Charlies gut. George would have to digest Charlie before getting to Albert, leaving the small fish relatively intact.