Complex sentence: A vertical section through the Greenside Mine drawn by a consultant mining engineer in 1853 shows three old access levels above the two levels which were in use at that time, and large areas of stoped out (worked out) ground.
Split into simpler sentences: A vertical section through the Greenside Mine was drawn by a consultant mining engineer in 1853. This shows three old access levels above the two levels which were in use at the time, and large areas of stoped out (worked out) ground.