Complex sentence: In the United Kingdom, for example, metric is the official system for most regulated trading by weight or measure purposes, but miles, yards, and feet remain the official units for road signage--and use of imperial units is widespread.
Split into simpler sentences: In the United Kingdom metric is the official system for most regulated trading by weight or measure purposes, but some imperial units remain the primary official unit of measurement. For example, miles, yards, and feet remain the official units for road signage--and use of imperial units is widespread.