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The phrase "long thought that" is absolutely correct and usable in written English.
It is typically used to introduce an idea or opinion that has previously been held by many people. For example: It has long been thought that a good night's sleep is essential for good health.
Exact(60)
I'VE long thought that General Motors' shaky public image could be traced to car rental lots.
It was long thought that songbirds did not use their sense of smell.
It was also long thought that blood pressure naturally rises with age.
But scientists have long thought that chimerism was a rare fluke.
Planetary scientists have long thought that asteroids that formed cores must have completely differentiated and melted throughout their interiors.
It has been long thought that the frequent respiratory infections in COPD patients are due to their depressed immune function.
Investigators long thought that nine men, divided into three death squads, attacked the Paris area on 13 November.
It was long thought that the red jungle fowl of India was the sole ancestor of the domestic chicken.
It was long thought that the predominant A1 receptor-meditated modulation by endogenous adenosine was a homeostatic process intrinsic to the synapse.
So it was long thought that milk could neutralise this stronger acid and relieve the pain.
Most scientists have long thought that the sun shone too steadily to affect conditions on Earth.
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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