Complex sentence: Introduced in 1990, it fit up to 50 lines on the screen and supported two sessions, either one through each communication port, or by multiplexing two sessions on one line with a suitable terminal server.
Split into simpler sentences: Introduced in 1990, it fit up to 50 lines on the screen. It also supported two sessions, either one through each communication port, or by multiplexing two sessions on one line with a suitable terminal server.