Complex sentence: He attended Miami Carol City High School in Miami Gardens for his freshman and sophomore years, and at the time of the shooting was a junior at Dr. Michael M. Krop High School in north Miami-Dade.
Split into simpler sentences: He attended Miami Carol City High School in Miami Gardens for his freshman and sophomore years. At the time of the shooting was a junior at Dr. Michael M. Krop High School in north Miami-Dade.