Complex sentence: Upgrades from v1.1.1 to v1.5 for both the unlimited license and 10-client license are $299 with the 10-client license being converted into an unlimited client license during the upgrade.
Split into simpler sentences: Upgrades from v1.1.1 to v1.5 for both the unlimited license and 10-client license are $299. The 10-client license will be converted into an unlimited client license during the upgrade.