Complex sentence: President Shukri al-Quwatli appointed him as his personal assistant in 1943, and by 1946, when the country regained its independence from France, al-Barazi became the president's closest advisor.
Split into simpler sentences: President Shukri al-Quwatli appointed him as his personal assistant in 1943. And by 1946, when the country regained its independence from the French, al-Barazi became the president's closest advisor.