Complex sentence: Constructed of flexible leather and coupled every 50 feet (15 m) with brass fittings, the length remains the standard to this day in mainland Europe whilst in the UK the standard length is either 23m or 25m.
Split into simpler sentences: Constructed of flexible leather and coupled every 50 feet (15 m) with brass fittings. The length remains the standard to this day in mainland Europe whilst in the UK the standard length is either 23m or 25m.