Complex sentence: In the early 1900s, Schwarzer resettled in Vienna and became a portrait and family photographer and chemist; to supplement his income, Schwarzer began making erotic photos used on naughty postcards common to this era.
Split into simpler sentences: In the early 1900s, Schwarzer resettled in Vienna and became a portrait and family photographer and chemist. To supplement his income, Schwarzer began making erotic photos used on naughty postcards common to this era.