Complex sentence: The aspect-markers "-ká -"go to "and"-dzá- "in future" or "come to" both usually have a high tone, which sometimes spreads: Hyman & Mtenje (1999a), p.104.
Split into simpler sentences: The aspect-markers "-ká -"go to "and"-dzá- "in future" or "come to" have the same tones as each other. In the Remote Perfect, the tone is high, and sometimes spreads: Hyman & Mtenje (1999a), p.104.