Complex sentence: Birst originally delivered its solution exclusively via a Software-as-a-Service model but, with Birst 5 (fall, 2011), the company additionally delivered its suite via a virtual appliance that can be hosted completely on premise.
Split into simpler sentences: Birst originally delivered its solution exclusively via a Software-as-a-Service model. With Birst 5 (fall, 2011), the company additionally delivered its suite via a virtual appliance that can be hosted entirely on premise.