Complex sentence: Proposals for lifting the track and moving it to an enclosed site have been suggested, but the cost is viewed as outweighing the benefits: the process would require much research, a large amount of money, and there is a risk of loss or damage.
Split into simpler sentences: Proposals for lifting the track and moving it to an undercover site have been suggested, but the cost outweighs the outcome. This process would require much research, a large amount of money, and there may be a possibility of loss or damage.