Complex sentence: Chiam also suffered a mild stroke in 2008, following which he had to cut back on some of his political activities, and this led some members of the SDA's Council to question whether he was able to properly fulfil his role of Chairman of the alliance.
Split into simpler sentences: Chiam also suffered a mild stroke in 2008, following which he had to cut back on some of his political activities. This led some members of the SDA's Council to question whether he was able to properly fulfil his role of Chairman of the alliance.