Simplify the following text for a Grade 7 native English-speaking person.
Original: All Chinese posthumous names for rulers end in one or two of the characters for `` emperor '' , HuÃ ngdÃ ( ç å , i.e. emperor ) , which can be shortened to DÃ ; except about a dozen or so less recognized ones who have had only DÃ and no HuÃ ng .
Simplified: Chinese posthumous names , for rulers , end in one or both symbols for `` emperor '' , HuÃ ngdÃ . This can be shortened to DÃ .