Complex sentence: It was first introduced in December 1989 and was designed by Canadian electronics company Applied Microelectronics Institute (now Amirix); the WeatherStar 4000 was manufactured by Northern Telecom.
Split into simpler sentences: It was first introduced in December 1989 and was designed by Canadian electronics company Amirix (then the Applied Microelectronics Institute). The WeatherStar 4000 was manufactured by Northern Telecom.