Simplify the following text for a Grade 5 native English-speaking person.
Original: American surveyors sometimes used a longer chain of 100 feet ( 30.48 m ) , known as the engineer 's chain or Ramsden 's chain .
Simplified: Americans sometimes used a longer chain of 100 feet ( 30.48 m ) . This is called the engineer 's chain or Ramsden 's chain .