Complex sentence: It was founded as Tripura Engineering College (TEC) in 1965 and upgraded to NIT in 2006 and is now a leading technical institute in North-Eastern region of India after NIT Silchar.
Split into simpler sentences: It was founded as Tripura Engineering College in 1965 and upgraded to a National Institute of Technology (NIT) in 2006. It is now the leading technical institute in the North-Eastern region of India after NIT Silchar.