Find out the complex sentence from below.

• Simple sentence:
- A simple sentence consists of a single independent clause that expresses a complete thought.
- একটি simple sentence এ শুধুমাত্র একটি clause থাকে অর্থাৎ একটি subject এবং একটি finite verb থাকে,
- যেমন: The sun shines brightly in the sky.

• Compound sentence -
- এ একের অধিক principal clause থাকে যাদেরকে co-ordinate clause বলা হয়।
- অর্থাৎ Compound sentence এ দুই বা ততোধিক principal clause বা co-ordinate clause থাকে।
- এছাড়া Compound sentence এ সাধারণত and, or, but, yet, so, therefore, otherwise, else, both --- and , either --- or , neither — nor, not only --- but also ইত্যাদি coordinating conjunction দ্বারা দুইটি principal clause যুক্ত থাকে।
-যেমন: 
- The movie was really interesting, but it was quite long.
- He loves to read books, so he spent the whole afternoon in the library.

• Complex sentence: 
- যে sentence এ একটি Principal clause এবং এক বা একাধিক Subordinate clause থাকে, তাকে Complex sentence বলে। 
- Complex sentence এর subordinate clause এর শুরুতে সাধারণত if, though, although, as, because, since, so that, that, until, till, unless, when, why, who, which, where, how, before, after, whether, while বসে।
যেমন:
- Even though she was tired, she stayed up late to finish her project.