Complex sentence: Abiogenic hypotheses saw a revival in the last half of the twentieth century by Russian and Ukrainian scientists, and more interest has been generated in the West after the publication by Thomas Gold in 1999 of "The Deep Hot Biosphere".
Split into simpler sentences: Abiogenic hypotheses saw a revival in the last half of the twentieth century by Russian and Ukrainian scientists. More interest was generated in the West after the 1999 publication by Thomas Gold of "The Deep Hot Biosphere".