Complex sentence: In the context of brass instruments, rotary valves are usually found on French horns, and sometimes on other brasses; many European classical trumpet players tend to favor rotary valves, as do some tuba players.
Split into simpler sentences: In the context of brass instruments, rotary valves are usually found on French horns, and sometimes on other brass instruments. Many European classical trumpet players tend to favor rotary valves, as do some tuba players.