Complex sentence: Following the creation of the Interstate Highway System in 1956, Interstate 70S was designated along the US 240 freeway while the bypassed portion of the original US 240 north of the current interchange between I-495 and I-270 was designated as MD 355 by 1960.
Split into simpler sentences: Following the creation of the Interstate Highway System in 1956, Interstate 70S was designated along the US 240 freeway. The bypassed portion of the original US 240, north of the current interchange between I-495 and I-270, was designated as MD 355 by 1960.