Complex sentence: Methylobacteria have been reported to exhibit resistance to chlorination and have been isolated from tap water in various clinical settings, including an investigation of a pseudo-outbreak, water from dental units, and blood bank purification units.
Split into simpler sentences: Methylobacteria have been reported to exhibit resistance to chlorination, and have been isolated from tap water in various clinical settings. Such settings have included: an investigation of a pseudo-outbreak, water from dental units, as well as blood bank purification units.