It was not always so easy to understand the calendar we use today as now.
Is the sentence grammatically correct? If not, please explain it.
It is not strictly ungrammatical, but it is rather awkward because of the gap between "so easy ... as now". I would change it to this: It was not always as easy as it is now to understand the calendar we use today.
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It is not strictly ungrammatical, but it is rather awkward because of the gap between "so easy ... as now". I would change it to this:
It was not always as easy as it is now to understand the calendar we use today.
I don't really know why it was harder to understand in the past, since the modern calendar was devised based on an adequate understanding. But that is what the se