Complex sentence: The Hailrail is a 60m long railgun with a yield of 90 megatons per bolt and was designed to provide orbital cover for Bolo brigades as they were able to engage ships before they entered orbit.
Split into simpler sentences: The Hailrail is a 60m long railgun with a yield of 90 megatons per bolt fire. The Hellrail was designed to provide orbital cover for Bolo brigades as the Hellrails were able to engage ships before they entered orbit.