it basically means "I need you to help me for these difficult sentences." All words are kinda slang in turkish as yigit explained.Usually teens use that or really close people each other.

Hello,let me explain to you. This sentence means "buddy its really difficult sentences can you help ? " Now lets look at the words Kanka=buddy Valla=its like "really" Zor cümleler=difficult sentences bir el atar mısın=this is expression,it means can you help ? Regards, Yiğit