Here is the sentence:

While Patrick is sightseeing, Squeeze will either find a patch of sunlight under a window or he will curl up under a table lamp.

When you use either ... or, you must have two equal grammatical items. After either, notice that you have half a verb phrase, find [Will find is the whole verb phrase]. But after or, you have a main clause, he will curl up under a table lamp. The structure is not parallel. Good choice, grammar gourmet!

To fix the sentence, you can change he will curl to curl.

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