Complex sentence: John calls Natalie and tells her that she can't take Liam out of the country, he searches for his passport and finds that Natalie has taken it, preventing him from following her to London, England.
Split into simpler sentences: John calls Natalie and tells her that she can't take Liam out of the country. He searches for his passport and finds that Natalie has taken it, preventing him from following her to London, England.