They are based generally on the type of magnifying lens that Sherlock Holmes used, or a miniature version of the telescope Lord Nelson put to his blind eye.
(They; are based generally; on the type of magnifying lens that Sherlock Holmes used, or a miniature version of the telescope) (lens; used; Sherlock Holmes) (the telescope; put; to his blind eye)
They lens the telescope
are based generally used put
on the type of magnifying lens that Sherlock Holmes used, or a miniature version of the telescope
Sherlock Holmes
to his blind eye