For example, "The dog ran" is an atomic sentence in natural language, whereas "The dog ran and the cat hid" is a molecular sentence in natural language.
[1] Logic has developed artificial languages, for example sentential calculus and predicate calculus, partly with the purpose of revealing the underlying logic of natural-language statements, the surface grammar of which may conceal the underlying logical structure.
It follows that an atomic sentence contains no logical connectives, variables, or quantifiers.
We might for example make the following assignments: Individual constants Predicates Sentential variables Under this interpretation the sentences discussed above would represent the following English statements: Sentences in natural languages can be ambiguous, whereas the languages of the sentential logic and predicate logics are precise.
Translation can reveal such ambiguities and express precisely the intended meaning.
For example, take the English sentence “Father Ted married Jack and Jill”.