We must suppose that, as the seasons rolled by, the plants grew and developed their spores and seeds;
(the seasons; rolled; by) (the plants; developed; their spores and seeds; T:as the seasons rolled by) (We; must suppose; that, as the seasons rolled by, the plants grew and developed their spores and seeds) Context(We must suppose,List([0, 15))):(the plants; grew; T:as the seasons rolled by)
We must suppose,List([0, 15))
the seasons the plants We the plants
rolled developed must suppose grew
by
their spores and seeds T:as the seasons rolled by
that, as the seasons rolled by, the plants grew and developed their spores and seeds
T:as the seasons rolled by