Complex sentence: Columbia Mall is an enclosed shopping center in the city of Grand Forks, North Dakota, the largest building of its kind within 120 km. It opened in 1978 and was developed by the Dayton Hudson Corporation.
Split into simpler sentences: Columbia Mall is an enclosed shopping center in the city of Grand Forks, North Dakota. It is the largest mall within 120 km. It opened in 1978 and was developed by the Dayton Hudson Corporation.