Complex sentence: Aside from new weapons, equipment, and perks that upgrade to "pro versions" after meeting utilization requirements, the player can choose three of fifteen killstreaks, which are earned after getting a certain amount of consecutive kills without dying.
Split into simpler sentences: Aside from new weapons, equipment, and perks that upgrade to "pro versions" after meeting utilization requirements. The player can choose three of fifteen killstreaks, which are earned after getting a certain amount of consecutive kills without dying.