Complex sentence: Only once has an application for a new Alko shop been denied: in 2003, an application for a location in Koivukylä, Vantaa, was rebuffed because there was a kindergarten next to the planned location.
Split into simpler sentences: Only once has an application for a new Alko shop been denied. In 2003, an application for a location in Koivukylä, Vantaa, was rebuffed because there was a kindergarten next to the planned location.