Complex sentence: Because of their growing number, social organizations of mutual aid were fouded, such as the Cruz Azul (Blue Cross) similar to the Red Cross, and Union y Patria (union and fatherland).
Split into simpler sentences: Because of their growing number, social organizations of mutual aid were founded. These included the Cruz Azul (Blue Cross) similar to the Red Cross, and Union y Patria (union and fatherland).