Complex sentence: The name "Wojtek" is a diminutive form of "Wojciech", an old Slavic name that is still common in Poland today and means "he who enjoys war" or "smiling warrior".
Split into simpler sentences: The name "Wojtek" is a diminutive form of "Wojciech", an old Slavic name that is still very common in Poland today. Thus the name has two meanings: "he who enjoys war" or "smiling warrior".