Complex sentence: The Mansion also had a lavish double door entrance and a huge crystal chandelier hanging over the main hall entrance as well as a red old skool telephone box downstairs underneath the main staircase.
Split into simpler sentences: The Mansion also had a lavish double-door entrance and a huge crystal chandelier hanging over the main hall entrance. There was also a red, old skool telephone box downstairs, which was underneath the main staircase.