Complex sentence: The UFO-memorial Emilcin is a memorial built in 2005 in Emilcin, Poland which remembers a supposed alien abduction at the site, which is said to have taken place there on May 10,1978.
Split into simpler sentences: The UFO-memorial Emilcin is a memorial built in 2005 in Emilcin, Poland. It remembers at a close encounter of third kind, which is said to have taken place there on May 10th, 1978.