Complex sentence: He was born in Bielefeld, where he had his first adventure at the age of four, when, to the distress of his parents, little Rüdiger disappeared without notice and was found only two days later, by the police.
Split into simpler sentences: He was born in Bielefeld, where he had his first adventure at the age of four. To the distress of his parents, little Rüdiger disappeared without notice and was found only two days later by the police.