Complex sentence: The runways were to the standard layout and specification with the main 02-20 runway at 2000 yds long and with the 13-31 and 07-25 runways at 1,400 yds.
Split into simpler sentences: The runways were to the standard layout and specification. The main 02-20 runway was 2000 yds long with the 13-31 and 07-25 runways at 1,400 yds.