Complex sentence: As a boy, Truman was interested in music, reading, and history, all encouraged by his mother, with whom he was very close--as president, he solicited political as well as personal advice from her.
Split into simpler sentences: As a boy, Truman was interested in music, reading, and history, all encouraged by his mother, with whom he was very close. As president, he solicited political as well as personal advice from her.