Underground nuclear tests, which lessen danger of fallouts and environmental pollution, have been mainly conducted since 60’s, while atmospheric tests were mainly conducted in the early days.
Can I omit 'were mainly conducted' because it's redundant?
like
"~~while atmospheric tests in the early days."
Top answer
In a word, no. But you could get away with it if you left off while . since the 60's; atmospheric tests, in the early days.
— CalifJim
In a word, no.
But you could get away with it if you left off while .
since the 60's; atmospheric tests, in the early days.
CJ
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