Complex sentence: Once Wilson took over, with Close as the senior professional Yorkshire enjoyed a period of almost unbroken success, winning the county championship again in 1960, taking second place in 1961, and winning again in 1962.
Split into simpler sentences: Once Wilson took over, with Close still as the senior professional, it seemed that Yorkshire did not know how to lose. Yorkshire won the county championship again in 1960, were second in 1961, and won again in 1962.