Form in the text: verwandelt
Here it describes a completed change of state, not the act of changing something else.
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Die Verwandlung war bereits geschehen, und doch lag das Zimmer still um ihn.
… fand er sich in seinem Bett zu einem ungeheueren Ungeziefer verwandelt.
Er lag auf seinem panzerartig harten Rücken und sah seinen gewölbten Bauch.
Here it describes a completed change of state, not the act of changing something else.
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Als Gregor Samsa eines Morgens aus unruhigen Träumen erwachte, fand er sich in seinem Bett zu einem ungeheueren Ungeziefer verwandelt.
The clause uses sich befinden with a result state. German places the participle verwandelt at the end, so the sentence holds back Gregor's transformation until its final word.
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Si tuviera tiempo, yo leería más libros.
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