Complex sentence: California uses an EMT-I or "EMT-One" Roman numeral designation which is equivalent to the National EMT-Basic; this is not EMT-Intermediate (hereafter EMT-I).
Split into simpler sentences: California uses an EMT-I or "EMT-One" Roman numeral designation which is equivalent to the National EMT-Basic. This should not be confused with the EMT-Intermediate (hereafter EMT-I).