research tends to suggest that positive reinforcement is generally more effective than negative reinforcement in gaining a change in behaviour in the long term, as with negative reinforcement the desired change often occurs only as long as there is a threat of punishment.

How would the previous sentence be correctly capitalized?
Research tends to suggest that positive reinforcement is generally more effective than negative reinforcement in gaining a change in behaviour in the long term, as with negative reinforcement the desired change often occurs only as long as there is a threat of punishment.