Complex sentence: Although local rheumatologists conceded that hydrotherapy is an accepted treatment and can be helpful for mild forms of rheumatism or muscle strain, they, along with dermatologists, remain sceptical of claims about the healing powers of the spring water.
Split into simpler sentences: Although local rheumatologists conceded that hydrotherapy is an accepted treatment and can be helpful for mild forms of rheumatism or muscle strain. However, the rheumatologists and dermatologists remain sceptical of claims about the healing powers of the spring water.