Complex sentence: Rat Tail was to be the foundation of an empire that now includes some of the best known companies in aggressive skating, 4x4 Urethane, Vicious Bearings and Ground Control.
Split into simpler sentences: Rat Tail was to be the foundation of an empire that now includes some of the best known companies in aggressive skating. These are 4x4 Urethane, Vicious Bearings and Ground Control.