Complex sentence: Amniotic fluid is mildly basic (pH 7.1-7.3) compared to normal vaginal secretions which are acidic (pH 4.5-6) and will turn the nitrazine paper from orange to dark blue.
Split into simpler sentences: Amniotic fluid is mildly basic (pH 7.1-7.3) compared to normal vaginal secretions which are acidic (pH 4.5-6). Basic fluid, like amniotic fluid will turn the nitrazine paper from orange to dark blue.