George Bernard Shaw was popular in English and American theaters.

Simple Subject is George Bernard Shaw
Simple Predicate is "was"

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You're welcome.

Actually, in the sentence "George Bernard Shaw was popular in English and American theaters," the simple subject is not just "George Bernard Shaw," but the complete noun phrase "George Bernard Shaw." The simple predicate is not only "was," but the complete verb phrase "was popular."

To identify the simple subject and simple predicate in a sentence, you can follow these steps:

1. Identify the verb or verb phrase in the sentence. In this case, the verb phrase is "was popular."

2. Ask yourself "Who?" or "What?" before the verb to find the subject. The answer to the question is the simple subject. In this case, the simple subject is "George Bernard Shaw."

3. Ask yourself "What did the subject (George Bernard Shaw) do?" or "What happened?" to find the predicate. The answer to the question is the simple predicate. In this case, the simple predicate is "was popular."

By following these steps, you can break down a sentence to identify its simple subject and simple predicate.