Complex sentence: Land for both the cemetery and a new Georgetown Presbyterian Church were donated by Dr. Charles Beatty, who provided one building lot of on the block, provided the property remained in use for either a church or a cemetery.
Split into simpler sentences: Land for both the cemetery and a new Georgetown Presbyterian Church were donated by Dr. Charles Beatty, who provided a building lot of on the block. Beatty required that the property must remain in use for either a church or a cemetery.