Complex sentence: Under communism, although his secular work began to be republished in the late 1960s, it was not until 2004, fifteen years after the fall of the regime, that the theological writings started being reprinted.
Split into simpler sentences: Under communism, his lay work began to be republished in the late 1960s. Iordanova, p.129,134 Nevertheless, it was not until 2004, fifteen years after the fall of the regime, that the theological writings started being reprinted.