Complex sentence: Weschler (2002), p.65 The preovulatory LH surge starts the first meiotic division in oocytes and initiates luteinization of thecal and granulosa cells.
Split into simpler sentences: Weschler (2002), p.65 Under the influence of the preovulatory LH surge, the first meiotic division of the oocytes is completed. The surge also initiates luteinization of thecal and granulosa cells.