Here is the sentence again:

When Simone and her husband discovered sixteen jars full of insects in their daughter's room, they decided to get Maria a dog, tolerating one four-legged animal seemed better than having fifty six-legged "pets" in the house.

They decided to get Maria a dog is a main clause. Tolerating one four-legged animal seemed better than having fifty six-legged "pets" in the house is a second main clause. Connecting these two main clauses with a comma makes a comma splice, a major sentence error.

A period after dog and a capital T for tolerating would fix the problem.

Go to the next sentence.

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