Why Yemen is at war?

Worshippers gather to perform Eid al-Fitr prayers marking the end of the holy fasting month of Ramadan in the Red Sea Port city of Hodeidah, Yemen June 15, 2018. REUTERS/Abduljabbar Zeyad

BEIRUT (Reuters) - The battle for the western Yemeni port of Hodeidah could be an important milestone in the three-year civil war. But analysts say the conflict is so complex that even a decisive outcome there might not bring peace.

Why is Yemen so divided?