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Discover LudwigSuggestions(5)
The phrase "are complex and often" is correct and usable in written English.
It can be used to describe something that has multiple layers or intricacies and occurs frequently in a particular context.
Example: "The issues we face in this project are complex and often require innovative solutions to address them effectively."
Alternatives: "are intricate and frequently" or "are complicated and commonly".
Exact(50)
The reasons for this are complex and often country specific.
Relations with Sri Lanka are complex and often tense.
The dynamics of religious discussion, discovery and change are complex and often unpredictable.
The reasons are complex and often unique, but the simple connection of cheapness isn't accurate.
But the criteria for classifying a village or county are complex and often revised.
Plant metabolic pathways are complex and often feature multiple levels of regulation.
Similar(10)
The hearing was complex and often couched in hypothetical terms.
It turns out to be complex and often counter-intuitive.
The answer is a third option: Influence is complex and often impossible to trace.
The process of reinvention after leaving Orthodox Judaism behind is complex, and often extremely difficult.
The old hedging strategies they had to employ were complex and often did not work.
More suggestions(15)
are cumbersome and often
are complex and sometimes
are complex and commonly
are tricky and often
are difficult and often
are complex and usually
are complex and typically
are multifaceted and often
are sophisticated and often
address complex and often
are small and often
are rare and often
are sparse and often
are scarce and often
are numerous and often
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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