Complex sentence: A variant of the Soyuz craft the LOK (Lunny Orbitalny Korabl) with a two-man crew would be launched on top of the N1 booster behind it would be the Lunnaya Kabina or LK mounted to a new rocket stage the'Block D'.
Split into simpler sentences: A variant of the Soyuz craft the LOK (Lunny Orbitalny Korabl) with a two-man crew would be launched on top of the N1 booster. Behind it would be the Lunnaya Kabina, or LK, mounted to a new rocket stage, the'Block D'.