Simplify the following text for a Grade 10 native English-speaking person.
Original: BBC Radio Scotland was founded as a full-time radio network in 1978 , although the name had been used since 1974 for the Scottish opt-out version of BBC Radio 4 ( previously the Scottish Home Service and then Radio 4 Scotland ) .
Simplified: BBC Radio Scotland was founded as a full-time radio network in 1978 , although the name had been used since 1974 for the Scottish opt-out parts of BBC Radio 4 .