Complex sentence: He brightened the formal and rhythmic structure of the concerto, in which he looked for harmonic contrasts and innovative melodies and themes; many of his compositions are flamboyantly, almost playfully, exuberant.
Split into simpler sentences: He brightened the formal and rhythmic structure of the concerto, in which he looked for harmonic contrasts and innovative melodies and themes. Many of his compositions are flamboyantly, almost playfully, exuberant.