Sentence:  The overall programme of the Pure Land Hall represents the process of rebirth in Sukhāvatī, and the three standing <WSD>Amitābhas</WSD> in the shrine represent the three possible manifestations of <WSD>Amitābha</WSD> to the dying believer on earth, which is the beginning of that process. 
Meaning of the word marked with <WSD> tags:  In (Pure Land Buddhism), a branch of Mahāyāna Buddhism, the name of the principal buddha regarded as of celestial origin.