Complex sentence: Following the election, he initially kept a low profile but later became more visible politically; after actively considering the possibility, in January 2015 he announced he would not mount a third run for the presidency in the 2016 presidential election.
Split into simpler sentences: Following the election, he initially kept a low profile, but later became more visible politically after actively considering the possibility. In January 2015, he announced he would not mount a third run for the presidency in the 2016 presidential election.