Complex sentence: Studies suggest that about 1.8% of the population have a partition ratio below 2100:1-for those people, a machine using a 2100-to-1 ratio could actually overestimate the BAC.
Split into simpler sentences: Studies suggest that about 1.8% of the population have a partition ratio below 2100:1. Thus, a machine using a 2100-to-1 ratio could actually overestimate the BAC.