Add spaces: Description:Burnetmothinbacklight

Answer: Description: Burnet moth in backlight

Add spaces: Perhapsthepassagegraves,likethedolmens,wereusedasakindof'charnelhouse',wherethebonesofancestorswerekeptaftertheyhaddecomposedsomewhereelse.

Answer: Perhaps the passage graves, like the dolmens, were used as a kind of 'charnel house', where the bones of ancestors were kept after they had decomposed somewhere else.

Add spaces: Itwouldbenefitonlyafew.Sucharesurfacereasons.

Answer:
It would benefit only a few. Such are surface reasons.