Complex sentence: Reaching the city was problematic for Abou Nader on two levels: in addition to the cold winter and the heavy snow descending on the highest city of Lebanon, the Syrian controlled most of the main roads leading in and out of the city.
Split into simpler sentences: Reaching the city was problematic for Abou Nader on two levels. In addition to the cold winter and the heavy snow descending on the highest city of Lebanon, the Syrian controlled most of the main roads leading in and out of the city.