Complex sentence: The party sought to accomplish this by advocating constitutional monarchy and, failing that, strong governmental powers within a republican framework; and by implementing a number of social and economic reforms, such as compulsory education, universal health care, and progressive income and property taxation.
Split into simpler sentences: The party sought to accomplish their task by advocating for constitutional monarchy and, failing that, strong governmental powers within a republican framework. Their goal was also to implement a number of social and economic reforms, such as compulsory education, universal health care, and progressive income and property taxation.