Complex sentence: Murray was an experienced soldier who had participated in the 1715 and 1719 risings and he now became de facto C-in-C. The Jacobite army remained at Perth for over a week while Murray organised them into an effective fighting force.
Split into simpler sentences: Murray was an experienced soldier who had participated in the 1715 and 1719 risings and he now became de facto C-in-C of the Jacobite army. They remained at Perth for over a week while Murray organised them into an effective fighting force.