Complex sentence: In the 1970s, an underground urban movement known as "Hip Hop" began to develop in the South Bronx area of New York City focusing on emceeing (or MCing), breakbeats, and house parties.
Split into simpler sentences: In the 1970s, an underground urban movement known as "Hip Hop" began to develop in the South Bronx in New York City. It focused on emceeing (or MCing), breakbeats, and house parties.