Add punctuation: To launch a webshop in a new market is a big decision
A: To launch a web-shop in a new market is a big decision.

Add punctuation: He served as President of the Kharkov Mathematical Society and was elected to the Academy of Sciences of the Ukraine
A: He served as President of the Kharkov Mathematical Society and was elected to the Academy of Sciences of the Ukraine.

Add punctuation: The name Mesothelioma is derived from mesothelium which is the membrane that covers and protects most of the internal organs of the body
A:
The name Mesothelioma is derived from mesothelium, which is the membrane that covers and protects most of the internal organs of the body.