Complex sentence: The empty block of the Inner circle was filled up in late 1970s with the construction underground market, a first in Delhi, "Palika Bazaar" at the junction point, stretching up to the Outer circle, it also came with an adjoining underground parking.
Split into simpler sentences: The empty block of the Inner circle was filled up in late 1970s with the construction of an underground market, a first in Delhi, "Palika Bazaar" at the junction point. Stretching up to the Outer circle, it also came with an adjoining underground parking.