Here is the sentence again:

Chet decided to get a huge Chinese dragon tattooed across his shoulder blades once the stabbing needle pierced his skin, however, Chet quickly changed his mind, opting to pierce an ear instead.

Chet decided to get a huge Chinese dragon tattooed across his shoulder blades is the first main clause. Once the stabbing needle pierced his skin, however, Chet quickly changed his mind ... introduces the second complete sentence. The spot where these two sentences meet is blank space, making a fused sentence.

To fix the problem, you could put a period after blades and capitalize the O for once.

Go to the next sentence.

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