Complex sentence: Methodolgy is based on fencing manuscripts from the 14th--17th century although with focus on the 14th--15th century, and this is enhanced with the practical knowledge gained through solo and partnered drilling, and free play (sparring).
Split into simpler sentences: Methodolgy is based on fencing manuscripts from the 14th to 17th centuries with a focus on the 14th and 15th centuries. This is enhanced with the practical knowledge gained through solo and partnered drilling, and free play (sparring).