Complex sentence: Among the numerous drawings, sketches, and studies found after Darden's death was found a study for the frontispiece of "Condemned Building", found in a box and drawn on yellow tracing paper.
Split into simpler sentences: Among the numerous drawings, sketches, and studies found after Darden's death was found a study for the frontispiece of "Condemned Building". It was found in a box and drawn on yellow tracing paper.