Complex sentence: Thereza assisted her father with his photographic experiments, which included pioneering photographs of the moon taken during the mid- 1850s from John Dillwyn Llewelyn's equatorial observatory at Penllergare Valley Woods.
Split into simpler sentences: Thereza assisted her father with his photographic experiments, which included the pruduction os some of the earliest photographs of the moon. These were taken during the mid- 1850s from Jher father's equatorial observatory at Penllergare Valley Woods.