Complex sentence: In the November 2016 election, voters passed an amendment legalizing recreational use of marijuana, the Adult Use of Marijuana Act (Proposition 64), and recreational cannabis became legal on January 1,2018.
Split into simpler sentences: In the November 2016 election, voters passed an amendment legalizing recreational use of marijuana. Following the passing of Adult Use of Marijuana Act (Prop.64), recreational cannabis became legal beginning January 1,2018.