Complex sentence: This type of aircraft was most widely used before and during World War II; its use fell into decline during the war when its vulnerability to enemy fighters became apparent, and in the post-war era this role replaced with improved bombsights and precision guided weapons.
Split into simpler sentences: This type of aircraft was most widely used before and during World War II; its use fell into decline during the war when its vulnerability to enemy fighters became apparent. In the post-war era this role replaced with improved bombsights and precision guided weapons.