Complex sentence: Nova Scotia Gardens was the area of a brick field, north-east of St Leonard's, Shoreditch, the brick clay had been exhausted and the area begun to be filled in with waste ("leystall", literally excrement).
Split into simpler sentences: Nova Scotia Gardens was the area of a brick field, north-east of St Leonard's, Shoreditch. The brick clay had been exhausted and the area begun to be filled in with waste ("leystall", literally excrement).