Complex sentence: Russian troops are conducting the process of "borderization" near South Ossetia-Georgia administrative boundary line, gradually advancing the occupation line inside Georgia to enlarge the Russian-held territory.
Split into simpler sentences: Russian troops are conducting the process of demarcation near South Ossetia-Georgia administrative boundary line. The process is also known as "borderization" and involves gradually advancing the occupation line inside Georgia to enlarge the Russian-held territory.