Complex sentence: Today, however, DOHC is sometimes confused with multivalve heads, since almost all modern DOHC engines have between three and five valves per cylinder--but'multivalve' and'DOHC' are separate distinctions.
Split into simpler sentences: Today, however, DOHC is sometimes confused with multivalve heads, since almost all modern DOHC engines have between three and five valves per cylinder. The terms'multivalve' and'DOHC' are separate distinctions.