Complex sentence: They are a joint product of the FTSE Group, and Euronext, providing pan-European indexes including the FTSEurofirst 300 Index and the Supersector Indexes.
Split into simpler sentences: They are a joint product of the FTSE Group, and Euronext. It provides pan-European indexes including the FTSEurofirst 300 Index and the Supersector Indexes.