Complex sentence: Bretschneider had been developing a steampunk-themed theme park in Pleasant Grove, Utah known as Evermore Park; one of its planned attractions was to be a mixed reality experience that would combine virtual reality technology with a physical environment.
Split into simpler sentences: Bretschneider had been developing a steampunk-themed theme park in Pleasant Grove, Utah known as Evermore Park. One of its planned attractions was to be a mixed reality experience that would combine virtual reality technology with a physical environment.