Original sentence: Similarly, during a recording session for Schumann's Toccata, Richter reportedly chose to play this piece (which Schumann himself considered "among the most difficult pieces ever written") several times in a row, without taking any breaks, in order to preserve the spontaneity of his interpretation
Edited sentence: Similarly, during a recording session for Schumann's Toccata, Richter reportedly chose to play this piece (considered among the most difficult pieces ever written) several times in a row, without taking any breaks, in order to preserve the spontaneity of his interpretation