We can combine the sentences as "Armadillos, a type of hard-shelled mammal native to Latin America, live for an average of 16 years in the wild."
According to the instructions, we must combine the sentences without adding any new words. That means we should not use relative pronouns such as "which", or conjunctions such as "and".
However, we can remove any unnecessary words. Thus, we can combine the sentences by following the steps below:
Following the steps above, we have: "Armadillos, a type of hard-shelled mammal native to Latin America, live for an average of 16 years in the wild."
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