She studied hard, and she passed the exam. (Make it complex)

- Compound: She studied hard, and she passed the exam.
- Complex: Since she studied hard, she passed the exam.

• And যুক্ত Compound sentence কে Complex করার নিয়ম:
- Sentence -এর প্রথমে since/as বসে (কারণ স্পষ্ট হলে),
- প্রথম Sentence বসে,
- And -এর পরিবর্তে comma(,) বসে,
- দ্বিতীয় sentence বসে।

• Structure: Since/As + প্রথম Sentence + and -এর পরিবর্তে comma(,) + দ্বিতীয় sentence.

• More examples:
- Compound: I was ill and could not attend the class.
- Complex: Since I was ill, I could not attend the class.