Complex sentence: The New Technology Telescope (NTT) is an alt-azimuth, 3.58-metre, Ritchey-Chrétien telescope inaugurated in 1989, the first in the world to have a computer-controlled main mirror.
Split into simpler sentences: The New Technology Telescope (NTT) is an altazimuth, 3.58-metre, Ritchey-Chrétien telescope inaugurated in 1989. It was the first in the world to have a computer-controlled main mirror.