Add punctuation: They can be dangerous affecting your blood pressure and liver They can also cause you to develop gynaecomastia often requiring alternative treatment This is clearly why many countries not all have banned some of them
A: They can be dangerous affecting your blood pressure and liver. They can also cause you to develop gynaecomastia often requiring alternative treatment. This is clearly why many countries (not all) have banned some of them.

Add punctuation: If you have some knowledge on steroids then you may probably know what Dianabol is all about it
A: If you have some knowledge on steroids, then you may probably know what Dianabol is all about it.

Add punctuation: For example a biodegradable plastic bag thats thrown into a hedge will still take years to disappear rather than days as some people believe
A:
For example, a biodegradable plastic bag that's thrown into a hedge will still take years to disappear, rather than days as some people believe.