Complex sentence: He died early and every one seems to him that this man well becomes the next emir but he died when his father was alive later on his death his father pass the powers to his older son Ali bin Abdulla Al-Thani.
Split into simpler sentences: He died early; everyone thought that he would well become the next emir, but he died when his father was alive. Later upon his death, his father passed the powers to his older son, Ali bin Abdulla Al-Thani.