Complex sentence: Unlike other "Counter-Strike" games, "Condition Zero" also contains a single-player mission pack with the player unlocking maps and more efficient bots as they pass certain requirements for each map while playing as a counter terrorist.
Split into simpler sentences: Unlike other "Counter-Strike" games, "Condition Zero" also contains a single-player mission pack with the player playing as counter-terrorist alongside bots. The player unlocks maps and more effective bot teammates as he or she passes certain requirements for each map while playing as a counter terrorist.