Complex sentence: The report speculated that Potolov, a Russian citizen, had also been arrested for entering the country illegally in 2001; authorities had deported Potolov to Kazakhstan, but he had returned to Turkmenistan to rejoin his wife and children.
Split into simpler sentences: The report speculated that Potolov, a Russian citizen, had also been arrested for entering the country illegally. In 2001 authorities had deported Potolov to Kazakhstan, but he had returned to Turkmenistan to rejoin his wife and children.