Complex sentence: The 1999 demolition did, however, result in Guyton and his supporters bringing a civil lawsuit against the City of Detroit, wherein the Wayne County Circuit Court ruled that the Heidelberg Project was protected "political speech" under the 1st Amendment as an outdoor art environment.
Split into simpler sentences: The 1999 demolition did, however, result in Guyton and his supporters' bringing a civil lawsuit against the City of Detroit. The Wayne County Circuit Court ruled that the Heidelberg Project was protected "political speech" under the 1st Amendment as an outdoor art environment.