In June 2015, after having traveled through the Middle East RT American reporter Caleb Maupin gave a talk. The 7:45 minute excerpt of his talk embedded below explains succinctly and better than most other material produced since then that I have watched, the war in Yemen. As Caleb shows, the war is between the popular Ansar Allah resistance fighters (mislabeled "Houthis" by the Saudis and the corporate newsmedia) and the invading army of the neighbouring dictatorship of Saudi Arabia.
As explained by Caleb in the e-mail which notified me of this video:
The mainstream media often obscures [the Yemen conflict], or tries to make it sound very complicated.
In reality, the war is not very complex. Saudi Arabia, with the support of the United States, is violating international law and suppressing Yemen's aspirations for democracy and independence.