Complex sentence: Alan Garthwaite, the collector and owner of the museum has been collecting McDonald's nick-nacks for over 25 years, his collection consists of Burger boxes, cups, hats, toys, watches, badges, dolls and uniforms, some dating back 40 years.
Split into simpler sentences: Alan Garthwaite, the collector and owner of the museum, has been collecting McDonald's knick-knacks for over 25 years. His collection consists of burger boxes, cups, hats, toys, watches, badges, dolls and uniforms, some dating back 40 years.