Complex sentence: His'cat' mentality is territorial, playful, sleepy, and has an extremely limited attention span, easily losing interest or being distracted by a thrown stick/plaything or being drugged by catnip.
Split into simpler sentences: His'cat' mentality is territorial, playful, sleepy, and has an extremely limited attention span. He can be easily distracted by a thrown stick or a plaything and is also capable of being drugged by catnip.