Simplify the following text for a Grade 9 native English-speaking person.
Original: In 1990 , Iraq accused Kuwait of stealing Iraqi oil through slant drilling , however some Iraqi sources indicated Saddam Husseinâ s decision to attack Kuwait was made only a few months before the actual invasion suggesting that the regime was under feelings of severe time pressure .
Simplified: The Iraqi invasion of Kuwait was a military campaign to occupy Kuwait in the Persian Gulf . Started by Saddam Hussein in 1990 who accused Kuwait of stealing Iraqi oil through slant drilling .