You will be given a definition of a task first, then some input of the task.
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

After independence in 1947 , Prasad was elected as President of the Constituent Assembly of India .
Output:
Upon independence in 1947 , Prasad was elected as President of the Constituent Assembly of India , which prepared the Constitution of India and served as its provisional parliament .