Complex sentence: At age 11, he entered the exclusive St. Albans School in Washington, DC. He struggled through school; a counselor told his mother that it was doubtful the boy had the potential to graduate.
Split into simpler sentences: At age 11, he entered the exclusive St. Albans School in Washington, DC. He struggled through school. A counselor told his mother that it was doubtful the boy had the potential to graduate.