Simplify the following text for a Grade 4 native English-speaking person.
Original: In 1863 , at the time of his banishment from Baghdad to Constantinople , BahÃ ` u 'll Ã h declared his claim to a divine mission to his family and followers . Tensions then grew between him and Subh-i-Azal , the appointed leader of the BÃ bÃ s who did not recognize BahÃ ` u 'll Ã h 's claim .
Simplified: Followers of this religion call themselves BahÃ ' Ã s. The name BahÃ ` u 'll Ã h is Arabic for `` The Glory of God '' .