Complex sentence: The recovery technique was only discovered during the First World War at the Experimental Physics Station, Farnborough by Frederick Lindemann, prior to this, spins were much feared by pilots as they were almost always fatal.
Split into simpler sentences: The recovery technique was only discovered during the First World War at the Experimental Physics Station, Farnborough by Frederick Lindemann. Prior to this, spins were much feared by pilots as they were almost always fatal.