Here is the sentence:

Natalia blinked her eyes, she wiped her glasses, and then squinted at the screen, but she could not decipher the small text crammed onto the presentation slide.

When you list actions, you must use parallel structure. Here, blinked and squinted are both simple past tense verbs, but she wiped her glasses is a main clause, wrecking the parallelism. Well done!

To fix the sentence, change she wiped to wiped.

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