Simplify the following text for a Grade 12 native English-speaking person.
Original: Abu Bakr , the first successor of Muhammad , according to Sunni beliefs , nominated Umar as his successor on his deathbed , and there was consensus in the Muslim community to his choice .
Simplified: Abu Bakr , the first successor of Muhammad , nominated Umar as his successor on his deathbed , and there was consensus in the Muslim community to his choice .