Complex sentence: Scaling and root planing is considered the basic treatment of periodontal diseases and may be the only treatment required to treat mild cases of periodontitis; however, it may also be the initial therapy prior to future surgical needs.
Split into simpler sentences: Scaling and root planing is considered the basic treatment of periodontal diseases and may be the only treatment required to treat mild cases of periodontitis. However, it may also be the initial therapy prior to future surgical needs.