Can a sentence have more than one prepositional phrase ?

Yes, a sentence can have more than one prepositional phrase.

Explanation:

It makes the sentence more confusing and should be avoided, but yes, it still can occur. An example: The dog is loved by the girl who is warming the milk on her stove for the cat who is purring in her basement. This not a concise sentence thus, it is slightly confusing. There are three prepositional phrases in this example which are: "on her stove," "for the cat," and "in her basement." I hope this is helpful for you.

compare & contrast informative essay/speech

when speaking or writing for the sole purpose of providing information in order to give audience members a good basis for making a decision, you would present an informative speech or essay.   because you wouldn’t want to be persuading the audience by arguing for one type of exercise over the other, you wouldn’t choose a persuasive/argumentative technique.   to fairly, and without bias, present information about the pros and cons of each type exercise, a compare/contrast, informative speech/essay would be the best bet.

the answer is slaves

douglas was a slave who turned into a statesman and he refused to celebrate the 4th of july until all slaves were emancipated or set free.