Simplify the following text for a Grade 9 native English-speaking person.
Original: Telnet was developed in 1969 beginning with RFC 15 , extended in RFC 854 , and standardized as Internet Engineering Task Force ( IETF ) Internet Standard STD 8 , one of the first Internet standards .
Simplified: It was developed in 1969 beginning with RFC 15 and is now defined as IETF STD 8 , which is one of the first Internet standards .