Complex sentence: However modern sources tend to regard this as outdated as they are now considered to be bacteria, Ed. Guiry, M.D., John, D.M., Rindi, F and McCarthy, T.K.2007.
Split into simpler sentences: However modern sources tend to regard this as outdated. They are now considered to be bacteria, Ed. Guiry, M.D., John, D.M., Rindi, F and McCarthy, T.K.2007.