Complex sentence: Most women will experience a painless leakage of fluid out of the vagina that may either present as a distinct "gush" or a steady flow of small amounts of watery fluid in the absence of steady labor contractions.
Split into simpler sentences: Most women will experience a painless leakage of fluid out of the vagina. They may notice either a distinct "gush" or a steady flow of small amounts of watery fluid in the absence of steady labor contractions.