The type of sentence given above is an example of a compound sentence. A compound sentence consists of two independent clauses. These independent clauses can either be separated by a comma and coordinating conjunction or a semicolon. The independent clauses above are separated by a semicolon. The independent clauses are, Pride is a powerful factor in an individual's behavior and it can also be the downfall of that individual.
This is probably because most people don't really care about why you're sending the email. They just to know what you'd like or what question you have. That's just my guess.
The sun in the golden cat basically symbolizes the attitude of the poem. It is a happy poem, in contrast the cat and the moon is more gloomy. Hope this helps! Also are you a k12 student?