Complex sentence: San Juan Hill is a slight incline to the east of Santiago, Cuba, where Spanish soldiers entrenched themselves in the most famous battle of the Spanish-American War; this engagement occurred at the same time as El Caney, several miles to the northwest.
Split into simpler sentences: San Juan Hill is a slight incline to the east of Santiago, Cuba, where Spanish soldiers entrenched themselves in the most famous battle of the Spanish-American War. That occurred at the same time as El Caney, several miles to the northwest.