Complex sentence: Plant growth regulators can be used to alter flower and plant sexuality, in cucumbers ethephon is used to delay staminate flowering and transforms monoecious lines into all-pistillate or female lines.
Split into simpler sentences: Plant growth regulators can be used to alter flower and plant reproductive systems. In cucumbers ethephon is used to delay staminate flowering and transforms monoecious lines into all-pistillate or female lines.