Complex sentence: Phil Manzanera, co-producer of the album, estimates that Gilmour has been writing the material for "Rattle That Lock" over the past five years, though he pointed out that one piano piece was recorded 18 years ago in Gilmour's living room.
Split into simpler sentences: Phil Manzanera, co-producer of the album, estimates that Gilmour has been writing the material for "Rattle That Lock" over the past five years. Though he pointed out that one piano piece was recorded 18 years ago in Gilmour's living room.