Complex sentence: Delaware's all-time record high of was recorded at Millsboro on July 21,1930; the all-time record low of was also recorded at Millsboro on January 17,1893.
Split into simpler sentences: Delaware's all-time record high of was recorded at Millsboro on July 21,1930. The all-time record low of was also recorded at Millsboro on January 17,1893.