Simplify the following text for a Grade 10 native English-speaking person.
Original: Feather Linux , created by Robert Sullivan , is a Knoppix-based Linux distribution which fits in under 128 MB ( while older versions were made to fit within 64 MB ) .
Simplified: Feather Linux , created by Robert Sullivan , is a Knoppix-based operating system which fits in under 128 MB ( while older versions were made to fit within 64 MB ) .