The watch imported from Switzerland is running well. (make it complex)

• Subject এরপরে verb টি past participle form এ থাকলে simple sentence কে complex sentence করার নিয়ম:
- প্রদত্ত sentence এর subject বসে।
- Relative pronoun (ব্যক্তি হলে who বসে, বস্তু হলে which / that) বসে।
- Tense অনুযায়ী auxiliary verb বসে।
- প্রদত্ত past participle থেকে sentence- এর বাকী অংশ বসে।

Simple Sentence: The watch imported from Switzerland is running well.
Complex Sentence: The watch which was imported from Switzerland is running well.

Source: Advanced Learner's Communicative English Grammar & Composition By Chowdhury & Hossain.