Complex sentence: One exception was "Lambert's Clavichord" (1928), one of the few compositions by a twentieth-century composer for that instrument, and inspired by a clavichord lent to Howells by his friend Herbert Lambert, an instrument maker and photographer based in Bath.
Split into simpler sentences: One exception was "Lambert's Clavichord" (1928), one of the few compositions by a twentieth-century composer for that instrument. It was inspired by a clavichord lent to Howells by his friend Herbert Lambert, an instrument maker and photographer based in Bath.