Complex sentence: Karaikudi became popular because the area is famous for the type of houses built with limestone called'karai veedu' and also may be due to a plant called "Karai" which is widely spread over this area.
Split into simpler sentences: Karaikudi became popular because the area is famous for houses built with limestone called'karai veedu'. It may also be due to a plant called "Karai" which is widely spread over this area.