、。
I apologized, so can we call the earlier thing even?
Literal
Apologized-[explanatory-んだ][because-から], earlier-[attributive-の] [topic-は] make-even-[chara-にして][assertive-よ].
Casual request between friends. チャラにする is slang meaning 'to call even, to wipe clean, to make square' — often used to settle debts, disputes, or past grievances. チャラ is onomatopoeic, originally mimicking the sound of shuffling or canceling. さっきの (literally 'the one from a little while ago') uses the pronominal の to stand in for an unspecified noun — 'the thing from earlier.' ~てよ is a casual request/plea.