The following verbs take only to-infinitives as their objects.
Literal
Following verbs [topic-は] to-infinitive [only-だけ] [object-を] object [to-に] take.
Another metalinguistic sentence explaining English grammar in Japanese. ｔｏ不定詞 uses full-width Latin letters for 'to,' standard in Japanese typography. 目的語にとる (take as an object) is grammatical terminology. だけ (only) restricts what the verbs accept.