Complex sentence: However unlike his owner, Gromit is more aware, he is not as eccentric as Wallace, and he think things carefully before he makes his actions, but his thoughts are very astute, which makes him quick-witted.
Split into simpler sentences: However unlike his owner, Gromit is more aware, he is not as eccentric as Wallace, and he think thinks carefully before he makes his actions. His thoughts are very astute, which makes him quick-witted.