Complex sentence: He often carries an umbrella that can transform its canopy into a series of spinning blades: this can be used as a miniature helicopter or as an offensive weapon; he often uses this to escape a threatening situation.
Split into simpler sentences: He often carries an umbrella that can transform its canopy into a series of spinning blades. This can be used as a miniature helicopter or as an offensive weapon; he often uses this to escape a threatening situation.