Question

find the relative clause. if it is nonrestrictive, set it off with commas. if it is restrictive, submit the text without making any changes.
with his boundless enthusiasm and natural charisma, the actor who played walter in a raisin in the sun stole the show.

Explanation:

First, identify the relative clause: "who played Walter in A Raisin in the Sun". This clause is restrictive because it narrows down which specific actor is being discussed (there are many actors, so this clause is necessary to specify the one in question). Restrictive relative clauses do not require commas.

Answer:

With his boundless enthusiasm and natural charisma, the actor who played Walter in A Raisin in the Sun stole the show.