Original: Saxe-Coburg became a part of Bavaria and Saxe-Gotha merged with other small states in 1920 to form the new state of Thuringia in the Weimar Republic.
Simplified: Saxe-Coburg became a part of Bavaria, and Saxe-Gotha merged with other small states to form the new state of Thuringia in 1920 in the Weimar Republic.