Complex sentence: Tamalpais Research Institute, also known as TRI Studios, is a virtual music venue in San Rafael, California; it is the brainchild of guitarist Bob Weir, formerly of The Grateful Dead.
Split into simpler sentences: Tamalpais Research Institute, also known as TRI Studios, is a virtual music venue in San Rafael, California. TRI is the brainchild of guitarist Bob Weir, formerly of The Grateful Dead.