Complex sentence: Today, the modern clan MacQuarrie is alive with an active society of global members and as nobody has claimed the right to be the next Chief for almost 200 years now, the chief-ship had lain dormant.
Split into simpler sentences: Today, the modern clan MacQuarrie is very much alive with an active society of global members. And since nobody has claimed the right to be the next Chief for almost 200 years now, the chief-ship has lain dormant.