But.
1. Separate. 2. Combined.
1. He is English. I am Scotch.
2. He is English, but I am Scotch.
1. I tried many times to solve cross-word puzzles. I never won a prize.
2. I tried many times to solve cross-word puzzles, but I never won a prize.
1. Urdu contains much Arabic. Hindi contains much Sanskrit.
2. Urdu contains much Arabic but Hindi much Sanskrit.