Grzymski

*802 In 2013, defendant Thomas Grzymski pleaded guilty to possession of heroin for sale and admitted to two sentencing enhancements under Health and Safety Code 1 section 11370.2 based on previous convictions for drug-related crimes. The trial court imposed a "split sentence" of 10 years, under which part of the total term would be served in county jail and the remainder would be served on mandatory supervision. (See Pen. Code, § 1170, subd. (h)(5).)

Over the next four years, Grzymski repeatedly violated the terms of his mandatory supervision. In a second prosecution in 2015, he admitted to transportation of methamphetamine and two additional section 11370.2 sentencing enhancements. The trial court imposed a split sentence of 10 years to run concurrent to the sentence in the first case. And in a third prosecution, which led to the November 2017 order from which Grzymski now appeals, the court sentenced him to 16 months in prison on weapons-related offenses, terminated mandatory supervision in the first two cases, and ordered that he serve the balance of the 10-year split sentences in prison.

Meanwhile, Senate Bill No. 180 (2017-2018 Reg. Sess.) was enacted in October 2017 and…