Complex sentence: The 1997 Zurich Open was a women's tennis tournament played on indoor hard courts at the Hallenstadion in Zürich in Switzerland that was part of Tier I of the 1997 WTA Tour.
Split into simpler sentences: The 1997 Zurich Open was a women's tennis tournament played on indoor hard courts at the Hallenstadion in Zürich in Switzerland. It was part of Tier I of the 1997 WTA Tour.