If you are using the sentence as a direct quote, you really should leave it as is. If you are using the information as a general statement, then you could rephrase it. EX: Large-bodied animals typically can retain heat quite easily; they can potentially have problems with overheating.
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HiroshiAnd I have no idea what the second sentence means. I would like you to paraphrase it with easier English.Animals with large bodies can have a problem keeping cool.