Language Point 26

David Ogilvy, ..., clarified this point to his newly appointed office heads by sending each of them a Russian nesting doll with five progressively smaller figures inside. (Para. 10)

Meaning: David Ogilvy, ..., made this point clear to his newly appointed office heads by sending each of them a Russian nesting doll which contained five figures that were doll by doll smaller.

Here "this point" refers to what has been said in the last sentence of the previous paragraph.