Complex sentence: The H-Net Network has been endorsed by many academic professional organizations, and for many disciplines, and for many disciplines and interdisciplinary subject areas, the related H-Net listserv is the primary internet discussion for scholars.
Split into simpler sentences: The H-Net Network has been endorsed by many academic professional organizations, and for many disciplines, an H-Net listserv is the primary informal venue for academic communication. For many disciplines and interdisciplinary subject areas, the related H-Net listserv is the primary internet discussion for scholars.