Answer:
subject: children and adults
simple predicate: prepare
complete predicate: prepare for the holiday by decorating their homes with symbols of springtime
Step-by-step explanation:
The subject of a sentence is its topic - what the sentence is about -, or what or who performs the action described by the verb. In this case, the ones who prepare are "children and adults".
The simple predicate of a sentence is the verb or verb phrase that indicates the action performed or the state of being. It can also be a linking verb. In this case, the simple predicate is "prepare".
The complete predicate includes everything that is not the subject. Therefore, the complete predicate in this case is "prepare for the holiday by decorating their homes with symbols of springtime."