Original sentence: Perry the Platypus (Dee Bradley Baker) is Phineas's and Ferb's pet, who lives a double life as a secret agent under the codename of Agent P (a notable difference between the two identities is that Agent P wears a secret agent hat)
Edited sentence: Perry the Platypus/ Agent P (Dee Bradley Baker) is Phineas's and Ferb's pet, who lives a double life as a secret agent under the codename of Agent P (a notable difference between the two identities is that Agent P wears a secret agent hat)