Complex sentence: Alignment of the sidecar is critical and the mountings come under considerable stress, making a quickly-detachable version largely impractical-in any case, the special sidecar tyres are poorly-suited to solo riding.
Split into simpler sentences: Alignment of the sidecar is critical and the mountings come under considerable stress, making a quickly-detachable version largely impractical. In any case, the special sidecar tyres are poorly-suited to solo riding.