Complex sentence: The service initially operated from its base in Nedlands in Western Australia to the Royal Air Force base at Lake Koggala near Galle in Sri Lanka, it was later extended to Karachi in Pakistan which was the terminus for the BOAC service from England.
Split into simpler sentences: The service initially operated from its base in Nedlands in Western Australia to the Royal Air Force base at Lake Koggala near Galle in Sri Lanka. It was later extended to Karachi in Pakistan, which was the terminus for the BOAC service from England.