Complex sentence: The confession account contained a scribbled footnote from the elder Trevor that recorded the fatal note delivered to him despite all previous accounts that Trevor never regained consciousness until the very end of his life, at which time he merely revealed where the confession lay.
Split into simpler sentences: The confession account contained a scribbled footnote from the elder Trevor that recorded the fatal note delivered to him. This contradicts the stated fact that Trevor never regained consciousness until the very end of his life, at which time he merely revealed where the confession lay.