Complex sentence: Itachi then appears behind Kakashi, and stabs him in the back with a kunai, although this is a clone created by Kakashi's Water Clone Technique, and it dissapates, to which Kisame complements Kakashi on his ability to use so many water-based jutsu.
Split into simpler sentences: Itachi then appears behind Kakashi, and stabs him in the back with a kunai. However, this is a clone created by Kakashi's Water Clone Technique, and it dissapates, to which Kisame complements Kakashi on his ability to use so many water-based jutsu.