Complex sentence: In 1999, they released the highly anticipated "Murda Muzik" album in which despite extensive bootlegging, the majority of its songs were unintentionally leaked which resulted in delays in the official album release.
Split into simpler sentences: In 1999, they released the highly anticipated "Murda Muzik" album which, despite extensive bootlegging, had the majority of its songs unintentionally leaked. This resulted in delays in the official album release.