During the same period in which the Maya were developing a hieroglyphic system of writing, the Aztec people also developed a written language, but it was not as highly sophisticated as that of the Maya and was more pictographic in nature.
but it was not as highly sophisticated as that of the Maya and was
but it was not as highly sophisticated as the Maya, being
but, not as highly sophisticated as the Maya's, was
not as highly sophisticated as that of the Maya, however, being
not as highly sophisticated as the Maya's however, it was
the two descriptions given should be grammatically parallel, since they are logically parallel (both are comparisons with the mayan writing system, and neither is subordinated to, dependent on, or emphasized over the other in any way). this sentence needlessly, and at cost to its clarity of meaning, subordinates one of the two observations as an appositive modifier.
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