Complex sentence: The R1100s was eventually superseded by the outwardly similar (but 20% more powerful at 122 hp with compression ratio raised to 12.5:1) R1200S of 2006--2007, but overall the R1100S was perhaps the more successful design.
Split into simpler sentences: The R1100s was eventually superseded by the outwardly similar R1200S of 2006--2007, which was 20% more powerful at with a compression ratio raised to 12.5:1. But overall the R1100S was perhaps the more successful design.