Complex sentence: It was built between 1942 and 1944 and was intended to house three 9.2 guns, but only two guns were installed and the fort never saw action.Once the war was over they fired it and the shell went all the way to the Malborouigh Sounds.
Split into simpler sentences: It was built between 1942 and 1944 and was intended to house three 9.2 guns, but only two guns were installed and the fort never saw action. After World War II was over, they fired one of tthe guns; the shell went all the way to the Malborouigh Sounds.