Complex sentence: In the 1930s, the experimental station W3XE, owned by Philco, became the first television station in Philadelphia; it became NBC's first affiliate in 1939, and later became KYW-TV (CBS).
Split into simpler sentences: In the 1930s, the experimental station W3XE, owned by Philco, became the first television station in Philadelphia. The station became NBC's first affiliate in 1939, and later became KYW-TV (CBS).