Complex sentence: Fortunately Sacco appeared unexpectedly and secured her position as his first female bookmaker (termed'clerking') in the largest online gambling organization in the United States (taking in approximately $1 Million per month in sport gambling bets).
Split into simpler sentences: Fortunately Sacco appeared unexpectedly and secured her position as his first female bookmaker. She was now employed by the largest online gambling organization in the United States (revenue approximately $1 Million per month in sport gambling bets).