Complex sentence: When Stewart discovered that Coacci had worked for both the plants that had been robbed, he returned with the Bridgewater police, but'Mike' Boda (aka Mario Buda) had since disappeared, along with his possessions and furniture.
Split into simpler sentences: When Stewart discovered that Coacci had worked for both the plants that had been robbed, he returned with the Bridgewater police. But'Mike' Boda (aka Mario Buda) had since disappeared, along with his possessions and furniture.