Complex sentence: The piece that stands apart from this largely neoclassical repertoire is "Solo" (1981), a hybrid minimalist and twelve-tone work employing as a guiding technical principle the gradual transformation of several pitch collections.
Split into simpler sentences: The piece that stands apart from this largely neo-classical repertoire is Solo (1981). Solo is a hybrid minimalist and twelve-tone work, employing, as a guiding technical principle, the gradual transformation of several pitch collections.