Complex sentence: Rodríguez spent 4 years working for them until he got a call from the US producers of the CSI TV series and IDW publishing crew, to make a comic version of the series.
Split into simpler sentences: Rodríguez spent 4 years working for them until he got a call from the producers of the CSI TV series and IDW publishing crew. Basically they wanted him to make a comic version of the series.