Complex sentence: When unfolded, comprising a whole side of the insert was a lengthy article printed entirely in Dutch and is in fact a review of a "Tonight's the Night" live show by Dutch journalist Constant Meijers for the Dutch rock-magazine "Muziekkrant Oor".
Split into simpler sentences: When unfolded, a whole side of the insert features a lengthy article printed entirely in Dutch. It is a review of a "Tonight's the Night" live show by Dutch journalist Constant Meijers for the Dutch rock-magazine "Muziekkrant Oor".