Complex sentence: After the privatisation of BREL, the St. Rollox site was operated as a rail maintenance facility by Alstom, surplus land was sold off and is now the site of a large Tesco, Costco and Lidl.
Split into simpler sentences: After the privatisation of BREL the St. Rollox site was operated as a rail maintenance facility by Alstom. Surplus land was sold off and is now the site of a large Tesco, Costco and Lidl.