Complex sentence: The Glendale Freeway was originally proposed to continue though Echo Park all the way to Hollywood Freeway (101), but since the plans are now scrapped, the freeway is relatively isolated from the rest of the LA freeway system.
Split into simpler sentences: The Glendale Freeway was originally proposed to continue though Echo Park all the way to Hollywood Freeway (101),. Since that plan has been scrapped, the freeway is somewhat isolated from the remainder of the LA freeway system.