Here is the sentence again:

Hunched over the keyboard for hours, Charlie used two fingers to hunt and peck out the 2,000-word research paper when lightning caused his computer to crash, Charlie wept more tears than the thunderclouds spilled rain.

Charlie used two fingers to hunt and peck out the 2,000-word research paper is a main clause. When lightning caused his computer to crash is a subordinate clause that begins a second main clause, Charlie wept .... Leaving the words paper and when smashed together creates a fused sentence.

To fix this error, you could put a period after paper and capitalize the W of when.

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