Complex sentence: Many of the multi-person record-breaking attempts were recorded at the BBC's Television Centre, in the large TC1 studio--at 995 square metres (10,250 ft²), one of the largest studios in Europe.
Split into simpler sentences: Many of the multi-person record-breaking attempts were recorded in the vast BBC TC1 studio at Television Centre. At 995 square metres (10,250 ft²), TC1 is one of the largest television studios in Europe.