Complex sentence: It was a demographic oddity that the majority of lowland Lao actually lived south of the Lao-Thai border; most of Lair's PARU recruits were thus of Lao origin, though Thai citizens.
Split into simpler sentences: It was a demographic oddity that the majority of lowland Lao actually lived south of the Lao-Thai border. Most of Lair's PARU recruits were thus of Lao origin, though Thai citizens.