Complex sentence: The United States is going through a change in relation to cannabis as said nation has seen that as of 2015 almost half of the United States has some form of medical cannabis policy and more states are making an effort towards legalizing cannabis for recreational purposes.
Split into simpler sentences: The United States is going through a change in relation to cannabis. As of 2015 almost half of the United States has some form of medical cannabis policy and more states are making an effort towards legalizing cannabis for recreational purposes.