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The phrase "are sometimes known" is correct and usable in written English.
It can be used when referring to terms, names, or concepts that have alternative names or designations that are not universally recognized.
Example: "These creatures, known for their unique patterns, are sometimes known as 'living fossils' due to their ancient lineage."
Alternatives: "are occasionally referred to" or "are sometimes called".
Exact(53)
These fields are sometimes known collectively as philosophical logic or applied logic.
These are sometimes known as Student Learning Objective (SLOs) assessments or value-added measures.
The members of the subfamily Meloinae are sometimes known as oil beetles.
This is junk that won't stay in one place.Retrotransposons are sometimes known as "jumping genes".
Gentes are not given taxonomic designations but are sometimes known by their host species ("redstart cuckoo," "dunnock cuckoo," etc.).
That frequency can easily penetrate seawater, so much so that reef areas are sometimes known as "blue deserts".
Similar(6)
The outermost primaries those connected to the phalanges are sometimes known as pinions.
For this reason, they are sometimes known as slime eels.
Those buildings, and more recently others close by, have become so full of the Orthodox that they are sometimes known as "the dormitories".
Zonatas, for instance, are sometimes known simply as "zs".
Small business or as they are sometimes known, small and medium-sized enterprises (SME's) contribute 47% of revenue to the U.K. economy.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com