Simplify the following text for a Grade 4 native English-speaking person.
Original: Sock puppets also appear in children 's television shows where they can be used alone on the puppeteer 's hand , without a complex stage or show . Two orange sock puppets named `` Fu '' and `` Fara '' are used in teaching German children how to read .
Simplified: Sock puppets are controlled by putting a hand through a sock .