Complex sentence: The Danelectro Company was the first to introduce the electric baritone guitar in the late 1950s, and the instrument began to appear in surf music, as well as background music for many movie soundtracks, especially spaghetti westerns.
Split into simpler sentences: The Danelectro Company was the first to introduce the electric baritone guitar in the late 1950s. However, the instrument began to appear in surf music, as well as background music for many movie soundtracks, especially spaghetti westerns.