Some of the ways a person can improve cohesion in his sentence are:
This refers to the unity in a sentence that a writer makes use of when he uses related ideas in a given sentence.
Hence, we can see that your question is incomplete as you did not attach the paragraph that contains the words of Obama, so a general overview was given to you.
Read more about sentence clarity here:
https://brainly.com/question/14800705
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