Sentence Correction (SC) | Re: While most of the earliest known ball courts in Mesoamerica date to 90

While most of the earliest known ball courts in Mesoamerica date to 900–400 b.c.,waterlogged latex balls found at El Manati and representations of ballplayers painted on ceramics found at San Lorenzo attest to the fact that the Mesoamerican ballgame was well established by the mid-thirteenth century b.c.

(A) waterlogged latex balls found at El Manati and representations of ballplayers painted on ceramics found at San Lorenzo attestcorrect, others have issues with SV agreement
(B) waterlogged
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