Complex sentence: By June 1,1950 Frontier Airlines (1950-1986) had a aquired Challenger Airlines when they merged with Arizona Airways and Monarch Airlines they provided service between 1950-1978 via Salt Lake City and Rock Springs, Wyoming.
Split into simpler sentences: By June 1,1950 Frontier Airlines (1950-1986) had a aquired Challenger Airlines when they merged with Arizona Airways and Monarch Airlines. They provided service between 1950-1978 via Salt Lake City and Rock Springs, Wyoming.