Complex sentence: Piti Bomb Holes has been built up as a tourist attraction allowing tourists to descend into an observatory where they can take in the beauty that has grown in a sinkhole (the name "Bomb Holes" is a misnomer).
Split into simpler sentences: Piti Bomb Holes has been created into a tourist attraction by allowing tourists to descend into an man-made observatory. Here, they can take in the beauty that has grown in this sinkhole (the name "Bomb Holes" is a misnomer).