Complex sentence: The first was in the 1980s when a man died after crashing his bike (prior to mandatory helmet laws), and the second in 2005 when a woman was blown into the path of an oncoming vehicle, being killed instantly.
Split into simpler sentences: The first was in the 1980s when a man died after crashing his bike (prior to mandatory helmet laws). The second in 2005 when a woman was blown into the path of an oncoming vehicle, being killed instantly.