There were three major advances in the evolution of land plants involving the development of an increasingly more effective reproductive system: First were the seedless, spore bearing plants such as ferns found in the great coal-forming swamps of the Carboniferous.
(land plants; involving; the development of an increasingly more effective reproductive system) (First; were; the seedless, spore bearing plants such as ferns) (ferns; found; L:in the great coal-forming swamps of the Carboniferous)
land plants First ferns
involving were found
the development of an increasingly more effective reproductive system
the seedless, spore bearing plants such as ferns
L:in the great coal-forming swamps of the Carboniferous