Simplify the following text for a Grade 5 native English-speaking person.
Original: The soprano voice was written in 1st line C clef ( soprano clef ) , the alto voice in 3rd line C clef ( alto clef ) , the tenor voice in 4th line C clef ( tenor clef ) and the bass voice in 4th line F clef ( bass clef ) .
Simplified: The tenor clef is another C clef .