Complex sentence: Jover (2005), 182 It is obvious that Ingres struggled with the sketch; the head is on a square of attached paper which obviously replaces an earlier cut out version, while areas have been rubbed over and heavily reworked.
Split into simpler sentences: Jover (2005), 182 It is obvious that Ingres struggled with the sketch. The head is on a square of attached paper which obviously replaces an earlier version that has been cut out, while areas have been rubbed over and heavily reworked.