Please capitalize where necessary: american william leonard hunt, who was known by the name signor farini, immediately saw the potential and with great success marketed the girl as “the missing link”: living proof of darwin’s theory on the descent of man.
A: American William Leonard Hunt, who was known by the name Signor Farini, immediately saw the potential and with great success marketed the girl as “The missing link”: living proof of Darwin’s theory on the descent of man.
Q: they're durable, but lightweight - and built to last longer than any labeling tool you've used.

A: They're durable, but lightweight - and built to last longer than any labeling tool you've used.
Q: each of the chapters 3-5 starts with an introduction that will provide you with a clear picture of the chapter's contents.
A: Each of the chapters 3-5 starts with an introduction that will provide you with a clear picture of the chapter's contents.
Problem: kontainer ensures professional and safe handling of files when music, images, videos, promotion videos, production schedules, artwork, press releases, etc. are exchanged between the involved parties.
Can you repeat this sentence, but capitalize it?
Answer: Kontainer ensures professional and safe handling of files when music, images, videos, promotion videos, production schedules, artwork, press releases, etc. are exchanged between the involved parties.
Text: number of clients/company databases 999 number of active clients, in addition to a test client

Correct capitalization: Number of clients/company databases 999 Number of active clients, in addition to a test client
Problem: black premium suede strap, 2.5-inch width. also available in brown suede (bss-25-brn).
Can you repeat this sentence, but capitalize it?
Answer:
Black premium suede strap, 2.5-inch width. Also available in brown suede (BSS-25-BRN).