Complex sentence: No weapons were fitted and the alclad skinning was laid out in spanwise strips; underneath the port wing the radiator bath started immediately behind the starboard undercarriage bay, with the opening conforming to the angle of the bay.
Split into simpler sentences: No weapons were fitted and the alclad skinning was laid out in spanwise strips. Underneath the wings the radiator bath started immediately behind the starboard undercarriage bay, with the opening conforming to the angle of the bay.