Complex sentence: The sticker helps health workers know when a vaccine is potent and when it must be thrown out, resulting in more reliable vaccinations as well as cost savings, because health workers no longer have to throw out vaccine just because they suspect it has gone bad.
Split into simpler sentences: The sticker helps health workers know when a vaccine is potent and when it must be thrown out. It promotes more reliable vaccinations as well as cost savings, because health workers no longer have to throw out vaccine just because they suspect it has gone bad.