Complex sentence: Ef (Ф ф; italics: "Ф ф") is a Cyrillic letter, commonly representing the voiceless labiodental fricative, like the pronunciation of ⟨ f ⟩ in "fill".
Split into simpler sentences: Ef (Ф ф; italics: "Ф ф") is a letter of the Cyrillic script. It commonly represents the voiceless labiodental fricative, like the pronunciation of ⟨ f ⟩ in "fill".