Complex sentence: This was valuable when paper punch cards were the standard method of storing this kind of information but because all stanines are integers two scores in a single stanine are sometimes further apart than two scores in adjacent stanines.
Split into simpler sentences: This was valuable when paper punch cards were the standard method of storing this kind of information. However, because all stanines are integers, two scores in a single stanine are sometimes further apart than two scores in adjacent stanines.