Complex sentence: The County's only major aircraft incident occurred in Ellicott City near Clarksville in 1962, when a Vickers Viscount disabled by a bird strike crashed on the Homewood farm killing all aboard.
Split into simpler sentences: The County's only major aircraft incident occurred in the city near Clarksville in 1962. A Vickers Viscount disabled by a bird strike crashed on the Homewood farm killing all aboard.