Complex sentence: Filters were introduced by Henri Cartan in 1937 and subsequently used by Bourbaki in their book "Topologie Générale" as an alternative to the similar notion of a net developed in 1922 by E. H. Moore and H. L. Smith.
Split into simpler sentences: Filters were introduced by Henri Cartan in 1937 and subsequently used by Bourbaki in their book "Topologie Générale". An equivalent notion called net was developed in 1922 by E. H. Moore and H. L. Smith.