Complex sentence: Robeson commented that the U.S. Navy was introducing and experimenting with breech-loading howitzers in the naval system, that Gatling guns were on every ship in the U.S. Navy, and that the Torpedo School at Newport was developing efficient torpedoes that could cause great destruction.
Split into simpler sentences: Robeson commented that the U.S. Navy was introducing and experimenting with breech-loading howitzers into the naval system. Robeson stated that the Torpedo School at Newport was developing efficient torpedoes that could cause great destruction.