Add spaces: Oldphotographiesandtheveryfirstsketches.

Answer: Old photographies and the very first sketches.

Add spaces: Andthegoodoldcustomofactuallyputtingapplesinappleslices,'renotentirelybadintheversionwithchillisyrupcookedapplepieces.

Answer: And the good old custom of actually putting apples in apple slices, 're not entirely bad in the version with chilli syrup cooked apple pieces.

Add spaces: MichelPlancherel'smainresearchfieldswereanalysis,mathematicalphysicsandalgebra.

Answer:
Michel Plancherel's main research fields were analysis, mathematical physics and algebra.