Complex sentence: They drew a map of the discoveries and line drawings depicting the expedition, noting the upstream conclusion by boat in the Grand Gallery, and on foot at Pool Chamber, which today forms part of the walking section of the show cave.
Split into simpler sentences: They drew a map of the discoveries and line drawings depicting the expedition, noting the upstream conclusion by boat in the Grand Gallery, and on foot at Pool Chamber. Today, this route to Pool Chamber forms part of the walking section of the show cave.