Complex sentence: Since the 2011 uprising against the Mubarak regime in Egypt, there has been increasing instability in the Sinai Peninsula, while the collapse of the Libyan regime also increased the quantity and sophistication of weapons being smuggled into the area.
Split into simpler sentences: Since the 2011 uprising against the Mubarak regime in Egypt, there has been increasing instability in the Sinai Peninsula. In addition the collapse of the Libyan regime increased the quantity and sophistication of weapons being smuggled into the area.