Complex sentence: Kramer becomes a martial arts expert at a karate academy for kids and convinces Elaine that she can run the company, which she does by putting her idea for an "urban sombrero" on the cover.
Split into simpler sentences: Kramer becomes a martial arts expert at a karate academy for kids. Kramer convinces Elaine that she can run the company, which she does by putting her idea for an "urban sombrero" on the cover.