Complex sentence: This was the second time in three years in which Kubiak experienced a health scare--in November 2013, while serving as the Houston Texans' head coach, Kubiak suffered a mini-stroke after collapsing on the field during a game against the Indianapolis Colts.
Split into simpler sentences: This was the second time in three years in which Kubiak suffered a health scare. In November 2013, while serving as the Houston Texans' head coach, Kubiak suffered a mini-stroke after collapsing on the field during a game against the Indianapolis Colts.