Complex sentence: This led to the foundation of the preliminary Reichskolonialbund in 193 and, second,\\ its incorporation "(Gliederung)" into the Nazi Party structure, therefore many references give two different years for its foundation, 1933 and 1936.
Split into simpler sentences: This led to the foundation of the preliminary Reichskolonialbund in 1933. This establishment was made in two steps, the second one being its incorporation "(Gliederung)" into the Nazi Party structure, therefore many references give two different years for its foundation, 1933 and 1936.