Complex sentence: The exhibition worked with the same biographies and perspectives of the First World War as the documentary drama series and the countless personal fates, which were embedded in the dramatic events of the era, formed the core of the exhibition.
Split into simpler sentences: The exhibition worked with the same biographies and perspectives of the First World War as the documentary drama series. The countless personal fates, which were embedded in the dramatic events of the era, formed the core of the exhibition.