Complex sentence: Thomas Jesse Yarnell, known as Jesse Yarnell, (1837--1906) was a California newspaperman who established the Los Angeles, California, "Weekly Mirror", which took over the "Los Angeles Times" in 1881 and later merged with it.
Split into simpler sentences: Thomas Jesse Yarnell, known as Jesse Yarnell, (1837--1906) was a California newspaperman who established the Los Angeles, California "Weekly Mirror". The "Weekly Mirror" took over the "Los Angeles Times" in 1881 and later merged with it.