1. Radha was ill but she was not hospitalised, (compound)
Though Radha was ill, she was not hospitalised, (complex)
2. The students were intelligent and so they were able to answer the questions correctly, (compound)
As the students were intelligent, they were able to answer the questions correctly, (complex)
3. I must get a visa or else I can’t travel abroad, (compound)
If I don’t get a visa, I can’t travel abroad, (complex)
4. I saw a tiger and it was wounded, (compound)
I saw a tiger which was wounded, (complex)
5. There was a bandh and so the shops were closed, (compound)
As there was a bandh, the shops were closed, (complex)