Complex sentence: Although the Arequipa Pottery was something of a sideline for the sanatorium, Rhead experimented with glazes, and was quite ambitious in the decorative techniques he taught: for example, he introduced tubelining (a technique also associated with his sister Charlotte).
Split into simpler sentences: Although the Arequipa Pottery was something of a sideline for the sanatorium, Rhead experimented with glazes and was quite ambitious in the decorative techniques he taught. For example, he introduced tubelining (a technique also associated with his sister Charlotte).