Complex sentence: However, Butler began to strenuously resist visits from the researchers, whom she felt overtaxed Genie and to whom she began disparagingly referring in her journal as the "Genie Team", a name which stuck.
Split into simpler sentences: However, Butler began to strenuously resist visits from the researchers, whom she felt overtaxed Genie. She began disparagingly referring to them as the "Genie Team", a name which stuck.