Complex sentence: The third herd, formed in 2012 with help from the The Prince of Wales's Charitable Foundation already consists of 4 cows and 2 heifers, which are also likely to take part in the artificial insemination process.
Split into simpler sentences: The third herd, formed in 2012 with help from the The Prince of Wales's Charitable Foundation, consists of 4 cows and 2 heifers. They are also likely to take part in the artificial insemination process.