Complex sentence: The main coagulase-positive staphylococcus is "Staphylococcus aureus", although not all strains of "Staphylococcus aureus" are coagulase positive.
Split into simpler sentences: The main coagulase-positive staphylococcus is "Staphylococcus aureus". Although not all strains of "Staphylococcus aureus" are coagulase positive.