Complex sentence: The Tonnetz (German for "tone-network") is a conceptual lattice diagram invented by Leonhard Euler in 1739 that shows a two-dimensional tonal pitch space created by the network of relationships between musical pitches in just intonation.
Split into simpler sentences: The Tonnetz (German for "tone-network") is a conceptual lattice diagram representing tonal space frist described by Leonhard Euler in 1739. It shows a two-dimensional tonal pitch space created by the network of relationships between musical pitches in just intonation.