Spring has come, and it's sunny. Should we put an end to it?

Spring has come and the weather is fine. This is a comma, not a period.

For example,' Spring has come and the weather is fine. It's time to fly a kite.'

Spring is coming, which is a description of the season in this sentence. The weather is sunny and describes the current weather. The season of flying kites is the knot of this sentence, which means that the foreshadowing is flying kites. This is a complete sentence.