Complex sentence: Used as a railway gun and using an elevation of 40 degrees the range was then 49,000 yards using 400 lbs of propellant what this did to the wear rate is unknown.
Split into simpler sentences: Used as a railway gun and using an elevation of 40 degrees the range was then 49,000 yards using 400 lbs of propellant. What this did to the wear rate is unknown.