Could you find errors in my sentences please? Is it ok to use several "since" in one sentence?
Currently, experts of the FGBIC "KamchatNIRO" have accumulated considerable experience in (or in filling evaluation of spawning grounds?) evaluation of filling spawning grounds by Pacific salmon producers . Since 1957, aerial surveys have been carried out annually in basins of the main Kamchatka fishing rivers.
But since aerial survey is an expensive method of studying filling the spawning grounds, since 2013 KamchatNIRO FGBNU experts, using international experience, have begun evaluation studies of salmon producers that have hydroacoustic systems "NetCor", and since 2017 - " BioSonics-DT-X. "
Top answer
) evaluation of filling spawning grounds by Pacific salmon producer s. Since 1957, aerial surveys have been carried out annually in the basins of the main Kamchatka fishing rivers. " I don't understand the underlined text.
- ) evaluation of filling spawning grounds by Pacific salmon producer s.
- Since 1957, aerial surveys have been carried out annually in the basins of the main Kamchatka fishing rivers.
- " I don't understand the underlined text.
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Currently, experts of the FGBIC "KamchatNIRO" experts have accumulated considerable experience in (or in filling evaluation of spawning grounds?) evaluation of filling spawning grounds by Pacific salmon producers. Since 1957, aerial surveys have been carried out annually
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