Complex sentence: The Laughing Cavalier mascot was introduced to the McEwan's brand in the 1930s, based on the well-known Frans Hals painting, and it has been used extensively in advertisements and branding ever since.
Split into simpler sentences: The Laughing Cavalier mascot was introduced to the McEwan's brand in the 1930s. Based on the well-known Frans Hals painting, it has been used extensively in advertisements and branding ever since.