Simplify the following text for a Grade 5 native English-speaking person.
Original: Halley 's Comet or Comet Halley ( or ; officially designated 1P\/Halley ) is the best-known of the short-period comets , and is visible from Earth every 75 to 76 years .
Simplified: Halley 's Comet ( Comet Halley ) is a comet which comes round every 75 or 76 years .