Complex sentence: Langkawi has been a Shangri-La for Coulson, but Sungai Petani was a busy town and the centre of a large district, in which Tunku's every moment was occupied.
Split into simpler sentences: Langkawi has been a Shangri-La for Coulson. But Sungai Petani was a busy town and the centre of a large district, in which Tunku's every moment was occupied.