Complex sentence: Gutta-percha is a name for a set of trees, mostly of the genus "Palaquium", noted for their latex, or the rigid natural latex produced from the sap of these trees, particularly from "Palaquium gutta".
Split into simpler sentences: Gutta-percha is a name for a set of trees, mostly of the genus "Palaquium", noted for their latex. The same term is used to refer to the rigid natural latex itself that is produced from the sap of these trees, particularly from the species "Palaquium gutta".