Complex sentence: The appeal said the patent application of Charles S. Bradley which Cowles had acquired in 1885 showed plans for using an internally rather than externally heated furnace which was one of the requirements Hall had told them they needed at Lockport.
Split into simpler sentences: The appeal said the patent application of Charles S. Bradley which Cowles had acquired in 1885 showed plans for using an internally rather than externally heated furnace. Internal heat was one of the requirements Hall had told them they needed at Lockport.