Complex sentence: Persons with aphthous stomatitis also have circulating lymphocytes which react with peptides 91--105 of heat shock protein 65-60, and the ratio of CD4 + T cells to CD8 + T cells in the peripheral blood of individuals with aphthous stomatitis is decreased.
Split into simpler sentences: Persons with aphthous stomatitis have circulating lymphocytes which react with peptides 91--105 of heat shock protein 65-60. Furthermore, the ratio of CD4 + T cells to CD8 + T cells in the peripheral blood of individuals with aphthous stomatitis is decreased.