Complex sentence: In the 1960s and 1970s taking a walk along the GST road was a common activity of elderly residents of Pallavaram; however, this has become uncommon today as the road now has heavy traffic at most times of the day.
Split into simpler sentences: In the 1960s and 1970s taking a walk along the GST road was a common activity of elderly residents of Pallavaram. However, this has become uncommon today as the road now has heavy traffic at most times of the day.