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A preference for what American linguists call “right-branching” sentences eases the cognitive load.

My favorite explanation of the difference in difficulty between flat, right-branching, and left-branching trees comes from Dr. Seuss’s Fox in Socks, who takes a flat clause with three branches, each containing a short right-branching clause, and recasts it as a single left-branching noun phrase: “When beetles fight these battles in a bottle with their paddles and the bottle’s on a poodle and the poodle’s eating noodles, they call this a muddle puddle tweetle poodle beetle noodle bottle paddle battle.”

Even when the sentence structure gets more complicated, a reader can handle the tree, because its geometry is mostly right-branching.

In a right-branching tree, the most complicated phrase inside a bigger phrase comes at the end of it, that is, hanging from the rightmost branch.

The following twenty-five-word phrase is splayed along a diagonal axis, indicating that it is almost entirely right-branching: flattish trees, each composed of simpler phrases joined side by side.