Complex sentence: In 1911 the first kraft sulphate mill was built in Florida.Iin 1915 the gable top milk carton was patented and in 1935 the first dairy plant was observed using them.
Split into simpler sentences: In 1911 the first kraft sulphate mill was built in Florida. In 1915 the gable top milk carton was patented and in 1935 the first dairy plant was observed using them.