Complex sentence: But in the case of Karlheinz Stockhausen, a student of Meyer-Eppler at the University of Bonn in 1954--56, his only use of the melochord was in a failed experiment with a ring modulator.
Split into simpler sentences: But in the case of Karlheinz Stockhausen, a student of Meyer-Eppler at the University of Bonn in 1954-56. His only use of the melochord was in a failed experiment with a ring modulator.