、。
At the very least, no one has become the equal of Maradona.
Literal
At-least, anyone-[even-も] Maradona [with-と] be-on-par-with existence become [topic-ては] has-not-become.
A formal sports-commentary statement. 比肩する ('to be on par with, to rival, to stand shoulder-to-shoulder with') is a literary/formal verb from 肩を並べる idiom. 存在 ('existence, being, presence') is often used metaphorically for 'a figure, a personage.' だれも~ない '(no one X).' なってはいない is the emphatic negative form ('has not yet reached X') — the topicalized ~ては contrasts with other possibilities. Diego Maradona is the Argentine football legend.