Complex sentence: Decca continued to propose that Dectra be used for the long-range role, but gave up these efforts in the late 1960s as inertial navigation systems began to be installed for these needs.
Split into simpler sentences: Decca continued to propose that Dectra be used for the long-range role. "Dectra in Iceland", Decca Navigator News, October 1967 Their efforts to standardize this were eventually abandoned as inertial navigation systems began to be installed for these needs.