Short Answer 
The phrase “not only… but also” emphasizes contrasting ideas, particularly Ben’s achievements despite dropping out of school. It highlights that he did not drop out at sixteen and became a millionaire before 21, showcasing how unexpected paths can lead to significant success.
Step 1: Understanding the Structure
The phrase ‘not only… but also’ is used to create a complex sentence that emphasizes the significance of two contrasting ideas. This structure helps in illustrating how one event can lead to unexpected outcomes. In this case, it accentuates Ben’s achievements against the backdrop of dropping out of school.
Step 2: Recognizing the Achievements
By using this structure, we underscore Ben’s incredible journey. The dual achievements to highlight are:
- Ben did not drop out of school at sixteen.
- He became a millionaire before turning 21.
These points illustrate the surprise and contrast between a lack of formal education and significant success.
Step 3: Interpreting the Outcome
This sentence provides a deeper understanding of Ben’s situation, showcasing how he defied expectations. The contrast created by ‘not only… but also’ illustrates the complexities of life and emphasizes that success can come from unexpected paths. Thus, it encourages readers to rethink assumptions regarding education and achievement.