Complex sentence: The governing Liberals contended that, although PST was a retail tax, the business sector was also subject to a 7% PST on most of its input; business in BC was put at a competitive disadvantage with business in other jurisdictions not subject to similar taxation.
Split into simpler sentences: The governing Liberals contended that, although PST was a retail tax, the business sector was also subject to a 7% PST on most of its input. It argued the business in BC was put at a competitive disadvantage with business in other jurisdictions not subject to similar taxation.