Having eaten lunch, he resumed work. (Make it complex)

- Simple: Having eaten lunch, he resumed work.
- Complex: When he had eaten lunch, he resumed work.

• Having + Verb এর past participle form যুক্ত Simple Sentence কে Complex Sentence এ রূপান্তরিত করার নিয়ম:
- প্রথমেই Having এর পরিবর্তে When বসে।
- তারপর Subject + had + Verb এর past participle form বসে।
- বাকী অংশ অপরিবর্তিতভাবে বসে।

• Structure: Having এর পরিবর্তে When বসে + Subject + had + Verb এর past participle form + বাকী অংশ।

• More examples:
- Simple: Having completed the task, she took a rest.
- Complex: When he had completed the task, she took a rest.

- Simple: Having finished the work, he left the office.
- Complex: When he had finished the work, he left the office.

Source: Advanced Learners Communicative English Grammar & Composition By Chowdhury & Hossain.