Complex sentence: Thermus group (Gram positive, but diderms with thick peptidoglycan), the members of the phylum Chloroflexi are monoderms, but stain mostly Gram negative.
Split into simpler sentences: Thermus group (Gram positive, but diderms with thick peptidoglycan). In contrast, the members of the phylum Chloroflexi are monoderms, but stain mostly Gram negative.