Complex sentence: Sometimes papers were written not by the student but by a tutor; there was a report that students accessed a team-maintained computer hard drive which contained a database of previous papers, and recycled them by making minor changes to each.
Split into simpler sentences: Sometimes papers were written not by the student but by a tutor. There was a report that students accessed a team-maintained computer hard drive which contained a database of previous papers, and recycled them by making minor changes to each.