Complex sentence: Quasi-steady state cosmology (QSS) is a cosmology which includes a single big bang as a special case, proposed in 1993 by Fred Hoyle, Geoffrey Burbidge, and Jayant V. Narlikar and is still advocated by some astronomers.
Split into simpler sentences: Quasi-steady state cosmology is a cosmology which includes a single big bang as a special case. QSS was proposed in 1993 by Fred Hoyle, Geoffrey Burbidge, and Jayant V. Narlikar and is still advocated by some astronomers.