Original sentence: There are ongoing investigations into Russian interference in the 2016 Brexit referendum being undertaken by the UK Electoral Commission, the UK Parliament's Culture Select Committee, and the United States Senate, on alleged Russian interference in the "Brexit" referendum of 23 June 2016
Edited sentence: There are ongoing investigations into alleged Russian interference in the 2016 Brexit referendum even though social media companies have discovered no evidence of said meddling' and is being undertaken by the UK Electoral Commission, the UK Parliament's Culture Select Committee, and the United States Senate, on alleged Russian interference in the "Brexit" referendum of 23 June 2016