Complex sentence: The heath itself consisted of 36 acres (146,000 m²) stretching northwards from Thornton Heath Pond towards Norbury: this was the common grazing land for the manor of Norbury.
Split into simpler sentences: The heath itself consisted of 36 acres (146,000 m²) stretching northwards from Thornton Heath Pond towards Norbury. This was the common grazing land for the manor of Norbury.