Complex sentence: Danielsen won his first talent show in 1988, at the age of twelve; the prize was a record deal and he released the single "Jeg Ser En Dag" (I See The Day).
Split into simpler sentences: Danielsen won his first talent show in 1988, at the age of twelve; the prize was a record deal. And he made his first recording contract when he was twelve and released the single "Jeg Ser En Dag" (I See The Day).