Complex sentence: It was discovered in 1998 by the Geneva Extrasolar Planet Search team and at the time of discovery was the extrasolar planet with the longest orbital period, though longer-period planets have subsequently been discovered.
Split into simpler sentences: It was discovered in 1998 by the Geneva Extrasolar Planet Search team. At the time of discovery was the extrasolar planet with the longest orbital period, though longer-period planets have subsequently been discovered.