Complex sentence: Parallel studies were carried out in the groups of Charles Radding (also at Yale) and Robert Lehman (Stanford University), providing the groundwork for our current understanding of the enzymatic mechanisms of recombination.
Split into simpler sentences: Parallel studies were carried out in the groups of Charles Radding (also at Yale University) and Robert Lehman (Stanford University). These three laboratories provided the groundwork for our current understanding of the enzymatic mechanisms of recombination.