Add punctuation: The hot tub will be not available until the 30 May 2015
A: The hot tub will be not available until the 30 May 2015.

Add punctuation: A cleansing cure should contain sulphurous amino acids especially cystine Selenium is also beneficial and so is vitamin C
A: A cleansing cure should contain sulphurous amino acids, especially cystine. Selenium is also beneficial and so is vitamin C.

Add punctuation: KWS POTATO BV benefits from synergies with other crops present within KWS in basic research
A:
KWS POTATO B.V. benefits from synergies with other crops present within KWS in basic research.