Complex sentence: An architectural design competition, organized by UNESCO in 1988 to choose a design worthy of the site and its heritage, was won by Snøhetta, a Norwegian architectural office, from among more than 1,400 entries.
Split into simpler sentences: An architectural design competition was organized by UNESCO in 1988 to choose a design worthy of the site and its heritage. The competition was won by Snøhetta, a Norwegian architectural office, from among more than 1,400 entries.