Complex sentence: This event expedited their intention to marry-Jack's father, Leo, refused to bail out Jack-so that Edie could access an inheritance from her grandfather's then unprobated estate to post Kerouac's bail.
Split into simpler sentences: This event expedited their intention to marry as Jack's father, Leo, refused to bail him out of jail. Once married, Edie could access an inheritance from her grandfather's then unprobated estate to post Kerouac's bail.