<span>Garrett Hardin believes that the World Food Bank would not provide the sustainability and assistance that the idea prescribes, and in reality would work against the interests of common people and increase favoritism and elitism among the world’s population.</span>
In this sentence, the pronoun is his, which means that the antecedent has to be the word that his refers to. The antecedent in this sentence is <span>Samuel. :)
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One way to vary the syntax of the text is to combine sentences since, in this way, your structures will be longer and more complex to follow. This could be done by means of links such as: however, in addition, therefore, etc. When using these words, you create semantic relations between the syntactic structures and make the reading process more difficult because, as I've I said, sentences become longer and therefore the reader has to keep more information in mind to follow the train of thought.
You could also vary the syntax by adding phrases or clauses. This option is similar to the previous one since it also refers to the complexity of the syntactic structures of the text.
That is true
Abuse their healthy in the wild then they are in cages or anything else they need to be in their own habitat