Complex sentence: Subsequently, in 2000, a program transited a new system of domain names registration in RU top-level domain which introduced a distributed system of second-level domain name registration in RU top-level domain through accredited Registrars.
Split into simpler sentences: Subsequently, in 2000, a new system of domain names registration in RU top-level domain was introduced. It was a distributed system of second-level domain name registration in RU top-level domain through accredited Registrars.