Complex sentence: Kramer asks to get the 23rd of December off, when he can't get it, he resumes the strike; meanwhile Elaine waits at the bagel place for a phone call from the denim vest guy.
Split into simpler sentences: Kramer asks to get the 23rd of December off; when he can't get it, he resumes the strike. Meanwhile Elaine waits at the bagel place for a phone call from the denim vest guy.