Complex sentence: Irene, Pete's alleged stalker, agrees to throw Sharon and Johnny a wedding on the roof of the building; it results in her inviting Robert Goulet, who conducts the ceremony and brings Pete and Berg back together as friends during the wedding.
Split into simpler sentences: Irene, Pete's alleged stalker, agrees to throw Sharon and Johnny a wedding on the roof of the building. This results in her inviting Robert Goulet, who conducts the ceremony and brings Pete and Berg back together as friends during the wedding.