Complex sentence: The cave was studied in 1963 at the initiative of South Peru Copper Corporation (as they found large cache of artifacts during their mining operations) who funded the study of the paintings in the caves by archeologists from Lima.
Split into simpler sentences: The cave was studied in 1963 at the initiative of South Peru Copper Corporation. They found a large cache of artifacts during their mining operations and funded the study of the paintings in the caves by archeologists from Lima.