Complex sentence: In addition, more subjects in the paroxetine group had experienced suicidal ideation, though according to GSK the significance of this did not become clear until later, when a meta-analysis from several trials was performed.
Split into simpler sentences: In addition, more subjects in the paroxetine group had experienced suicidal ideation. According to GSK the statistical significance of this did not become clear until later, when a meta-analysis from several trials was performed.