Complex sentence: Traditionally only one channel of Radio Guangdong is dedicated to Mandarin (Putonghua), however in recent years there has been an increase in Mandarin programmes in most Cantonese channels.
Split into simpler sentences: Traditionally only one channel of Radio Guangdong is dedicated to Mandarin (Putonghua). However, in recent years there has been an increase of Mandarin programmes in most Cantonese channels.