Complex sentence: As of April 2011 some of the first ship timbers are completing their PEG treatment after which they will be freeze dried in order to rid them of any excess water still remaining and allow them to be handled outside of water in which they must currently be kept.
Split into simpler sentences: As of April 2011 some of the first ship timbers are approaching the end of their PEG treatment cycle. After which they will be freeze dried in order to rid them of any excess water still remaining, allowing them to be handled outside of water in which they must currently be kept.