Complex sentence: Very early in their career, they released an instrumental 12 single vinyl record called "The Break" under the name Kat Mandu, the single was successful and peaked at number three on the disco chart.
Split into simpler sentences: Very early in their career, they released an instrumental 12 single vinyl record called "The Break" under the name Kat Mandu. The single was successful and peaked at number three on the disco chart.