This is the 7841st most frequent Russian word.
кайли
"Кайли" is a colloquial term used in Russian to refer to a pickaxe.
Here, 'Кайли' is used as a proper noun, referring to a person's name.
Кайли учится играть на гитаре.
Kylie is learning to play the guitar.
In this context, 'кайли' is a plural form of the word 'кайло', referring to a hammer-like tool, especially used in climbing or mining.
Мы взяли кайли для подъёма на скалу.
We took rock hammers for climbing the cliff.
Here, 'Кайли' might be an instrumental tool and 'казался сложным' indicates a description of its characteristics.