I'm interested in how the air force was able to get these air fields built from grass strips to concrete.
(I; 'm; interested in how the air force was able to get these air fields) (the air force; was; able to get these air fields) (the air force; to get; these air fields built from grass strips to concrete) (these air fields; built; to concrete)
I the air force the air force these air fields
'm was to get built
interested in how the air force was able to get these air fields
able to get these air fields
these air fields built from grass strips to concrete
to concrete