Complex sentence: The Yip-Yips are characters on the popular children's television show "Sesame Street" interplanetary visitors, presumed to be from the planet Mars, that used to be terrified by things like clocks, telephones and computers.
Split into simpler sentences: The Yip-Yips are characters on the popular children's television show "Sesame Street". They are interplanetary visitors, presumed to be from the planet Mars and used to be terrified by things like clocks, telephones and computers.