Complex sentence: Singalila National Park is located 13 km far from Bagdogra International Airport in Bagdogra.It is the nearest airport to Singalila National Park, But to reach by drive it is less than 100 km it could take 3--4 hours.
Split into simpler sentences: Singalila National Park is located 13 km from Bagdogra International Airport in Bagdogra. That is the nearest airport, but by road it is less than 100 km and takes 3 to 4 hours.