Complex sentence: During WWII they retooled their factories to make aluminum products for the military and when the war ended in 1945, the company looked for a new market and branched out into aluminum toys as well making the popular Sno-Coaster saucer shaped sled.
Split into simpler sentences: During WWII they retooled their factories to make aluminum products for the military. When the war ended in 1945, the company expanded into aluminum toys as well making the popular Sno-Coaster saucer shaped sled.