Complex sentence: Greenwich Hospital remained the principal landowner in the parish and owner of the extensive mineral rights up until the 1960s when the estate was transferred to the Trustees for Catholic Purposes who a few years ago sold their remaining properties in Alston Moor.
Split into simpler sentences: Greenwich Hospital remained the principal landowner in the parish and owner of the extensive mineral rights up until the 1960s. The estate was then transferred to the Trustees for Catholic Purposes who a few years ago sold their remaining properties in Alston Moor.