Complex sentence: Palicki appeared in The WB pilot "Aquaman" as the evil Nadia, but the pilot was not picked up for series by the CW network, a result of The WB and UPN network merger, which occurred while the pilot was being filmed.
Split into simpler sentences: Palicki appeared in The WB pilot "Aquaman" as the evil Nadia. The pilot was not picked up for series by the CW network, a result of The WB and UPN network merger, which occurred while the pilot was being filmed.