Complex sentence: Later a still fully outfitted Major Tom can be seen spinning around in space, with a panicked Ground Control attempting to contact him; the spinning Major Tom is either the reality of the situation, or Ground Control's imagination.
Split into simpler sentences: Later a still fully outfitted Major Tom can be seen spinning around in space, with a panicked Ground Control attempting to contact him. Implying either the spinning Major Tom is the reality of the situation or the Ground Control's imagination.