Complex sentence: Marsh asked Nation for a draft script for a second "Blake's 7" episode in June 1976 and Nation duly delivered "Space Fall", in which the spacecraft, "Liberator", is introduced, in mid-August.
Split into simpler sentences: Marsh asked Nation for a draft script for a second "Blake's 7" episode in June 1976. Nation delivered "Space Fall", in which the spacecraft, "Liberator", is introduced, in mid-August.