、。
Well, it's never too late to correct a mistake.
Literal
Well, mistake [obj-を] correct [at-に] too-late [quot-という] thing [topic-は] not-exist.
An aphoristic line echoing the classical proverb 過ちては改むるに憚ること勿れ ('do not hesitate to correct your mistakes'). ~るに is the classical-leaning nominalizing use of に ('at / for the doing of X'), preserving a mildly literary feel; contemporary prose would use ~るのに. ~すぎる 'too much' attaches to adjectives and verbs to mean 'excessively'; here 遅すぎる 'too late.' ということはない 'it's not the case that X' is an emphatic negative idiom.