Complex sentence: He built up some stock but was they were suffering the ill effects of inbreeding and so he was very fortunate to find out that Dutch Chicken breeder Jaap Beekman had the last few Jersey Giants in The Netherlands.
Split into simpler sentences: He built up his stock but they were suffering the ill effects of inbreeding. He was very fortunate to find that Dutch chicken breeder Jaap Beekman had the last few Jersey Giants in The Netherlands.