Complex sentence: Severstal also owns "Severstal Cherepovets", a professional ice hockey club which plays in the Kontinental Hockey League and Severstal Air Company, an airline operating mainly from Vnukovo International Airport and from its home base Cherepovets Airport.
Split into simpler sentences: Severstal also owns "Severstal Cherepovets", a professional ice hockey club which plays in the Kontinental Hockey League. Severstal company also owns an airline-Severstal Air, operating mainly from Vnukovo Moscow Airport and from its home base Cherepovets Airport.