Complex sentence: He hides in a doorway as a couple come past from a night out, and then escapes whilst using a fire extinguisher and door signs ("Private ","Exit", etc.) to cover his private parts, and avoiding people.
Split into simpler sentences: He hides in a doorway as a couple come past from a night out. Once they've gone, he escapes whilst using a fire extinguisher and door signs ("Private ","Exit", etc.) to cover his private parts, and avoiding people.