Complex sentence: Don and Cheryl surveyed and photographed the cave in April and May, 1985, and drafted the map and cross sections that were originally published in the special PAWR report and have been reproduced in many times since.
Split into simpler sentences: Don and Cheryl surveyed and photographed the cave in April and May, 1985. The map and cross sections they created were originally published in the special PAWR report and have been reproduced in many times since.