TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: What did the American Philosophical Society do with the memoir what did they produce in 1809?

SOLUTION: What did the American Philosophical Society produce in 1809?

PROBLEM: Who were later, no who were later Yuan emperors isolated with?

SOLUTION:  Who were later Yuan emperors isolated with?

PROBLEM: How are those I mean what are those with higher incomes often unable to manage?

SOLUTION:
What are those with higher incomes often unable to manage?