Complex sentence: It has sometimes been said that Margulis not only preached symbiosis but actively lived it, a prime example of this being that many of her major works, particularly those intended for a general readership, were collaboratively written with her son Dorion Sagan.
Split into simpler sentences: It has sometimes been said that Margulis not only preached symbiosis but actively lived it. Many of her major works, particularly those intended for a general readership, were collaboratively written with her son Dorion Sagan.