Complex sentence: Doctors think that over time, there could be more people who are born with Fields Condition, but for now they are simply trying to learn more about it, so that if it becomes more widespread, they will have a head start on it.
Split into simpler sentences: Doctors think that, over time, there could be more people who are born with Fields Disease. For the time being, they are simply trying to learn more about it, so that if it becomes more widespread, they will have a head start on it.