、・。
In the sense that you don't appreciate health until you lose it, it's a lot like parents, or water, or air.
Literal
Health [topic-は] be-lost-and thankfulness [subject-が] becomes-understood point [in-において], parents [and-や] water [and-・] air [with-と] same [like-のような] thing is.
A philosophical aphorism. The main frame ~点において ('in the point that X,' 'in the respect that X') is a formal/written comparison marker, used to isolate a specific axis along which two things are alike. や is an exhaustive-but-open list particle: 親や水・空気 lists three items with the implication 'and similar things.' ~と同じような is the standard comparative: '(is) the same kind of thing as X.' The sentence's insight — that certain vital things only become visible when lost — is made sharper by the concrete triple of 親 (parents), 水 (water), 空気 (air). 有難味 (ありがたみ, 'thankfulness') is the noun form of 有難い ('grateful, precious'), meaning 'the quality of being something to be thankful for.'