Complex sentence: In the past, Sechskies's official fanclub was called DSF (Dear Sechskies Friend) and Sechskies official fanclub color was yellow since their creation, fans using yellow balloons and yellow raincoats as main cheering tools.
Split into simpler sentences: In the past, SechsKies' official fanclub was called DSF (Dear SechsKies Friend) and the official fanclub color was yellow since their creation. SechsKies fans used yellow balloons and yellow raincoats as main cheering tools.