Complex sentence: The first objects of his attentions were the members of the Royal Academy, and these attempts being well received, he soon began to fly at higher game, the King and Queen being the most frequent marks for his satirical shafts.
Split into simpler sentences: The first objects of his attentions were the members of the Royal Academy. These attempts being well received, he soon began to fly at higher game, the King and Queen being the most frequent marks for his satirical shafts.