Complex sentence: An obvious problem with this arrangement on the XF5U-1 was that the propeller's radius covered nearly the entire frontal area of the aircraft, making the installation of forward-firing weapons such as machine guns, cannon, or missiles virtually impossible.
Split into simpler sentences: An obvious problem with this arrangement on the XF5U-1 was that the propeller's radius covered nearly the entire frontal area of the aircraft. A typical installation of any forward-firing weapons such as machine guns, cannon, or missiles would be virtually impossible.