Complex sentence: Traditionally it was thought that if there is no chance of healing, then it is best to remove the damaged and non-functional meniscus, although at least one study has shown that there is little significance if a meniscectomy is done.
Split into simpler sentences: Traditionally it was thought that if there is no chance of healing, then it is best to remove the damaged and non-functional meniscus. However at least one study has shown that there is any significance if a meniscectomy is done.