Original: The later Gravettian occupation, which occurred 25,000 to 27,000 years ago, left little but a child's footprints, the charred remains of ancient hearths and carbon smoke stains from torches that lit the caves.
Simplified: The only traces left of the later occupation during the Gravettian include a child's footprints, the charred remains of ancient hearths and carbon smoke stains from torches that lit the caves.