Complex sentence: Two studies between 1996 and 2002 studied the effects of granular baits on meat ant colonies and some of the baits containing hydramethylnon and fipronil effectively reduced the number of workers foraging.
Split into simpler sentences: Two studies between 1996 and 2002 studied the effects of granular baits on meat ant colonies. Bait containing hydramethylnon and fipronil effectively reduced the number of workers foraging.