Complex sentence: The ARPANET was the predecessor to the Internet established by the United States Department of Defense Advanced Research Projects Agency (ARPA), and when the Domain Name System was introduced in 1985, ARPANET host names were initially converted to domain names by adding.
Split into simpler sentences: The ARPANET was the predecessor to the Internet, established by the United States Department of Defense Advanced Research Projects Agency (ARPA). When the Domain Name System was introduced in 1985, ARPANET host names were initially converted to domain names by adding.