Complex sentence: While in his 40s Becker ran the New York City Marathon a half a dozen times but with age he is now limited to half-court basketball, ping pong, and attendance at all sporting events involving his grandchildren.
Split into simpler sentences: While in his 40s Becker ran the New York City Marathon a half a dozen times. However, with age he is now limited to half-court basketball, ping pong, and attendance at all sporting events involving his grandchildren.