Complex sentence: The balloon was losing 68 kilograms (150 lb) of lift force a day, and, taking into account its heavy load, Ekholm estimated that it would be able to stay airborne for 17 days at most, not 30.
Split into simpler sentences: The balloon was losing 68 kilograms (150 lb) of lift force a day. Taking into account its heavy load, Ekholm estimated that it would be able to stay airborne for 17 days at most, not 30.