Feel my pain; Edit this.

Leave it as it is.

Evaluations of building mold are typically based upon surface and airborne samples. But these evaluations cannot establish a relationship between the mold and the extent of ongoing occupant exposure, or water damage. Nor can they relate to the conditions which must be resolved to prevent future mold growth.

I often start sentences with conjunctions but this sounds like more formal writing.

Very long sentence. I'll go with Jack here. Have mercy on your readers.

Typical building-mold evaluations are often based primarily on airborne and surface instances (samplings specimens, traces, etc), but these data cannot be related to ongoing effect of the occupant on its accumulation, the extent of any water damage, or other such conditions requiring attention

Also like Jack's above

No buts..... .
Evaluations of building mold are typically based upon surface and airborne samples. These evaluations, however, cannot establish a relationship between the mold and the extent of ongoing occupant exposure, or water damage. Nor can they relate to the conditions which must be resolved to prevent future mold growth.

Joe(no ifs and either)Nation

Then how shall we sit down?

OK, I agree. Yours sounds better. But, is it any more correct?

Roger: ... but this sounds like more formal writing.

Does that make a difference, Roger?

Why no 'buts', Joe?