Not a lawfag but I think (b) is saying,
If someone commits 3 offenses over time, such as a continuation of a criminal enterprise. 1, 2, and 3, where 3 occurs on or after 1/1/19, 1 and 2 become chargeable offenses also.
Think logically.
Who are they calling terrorists?
Huma works for REAL terrorists, they're not calling themselves terrorists.
So, who are they calling terrorists?
Who else are polygamists?