Add spaces: Mostpeoplesufferingfromthediseaseexperiencealternatingperiodsofworseningandsymptomrelief.

Answer: Most people suffering from the disease experience alternating periods of worsening and symptom relief.

Add spaces: EvaluationofEcophonsystems

Answer: Evaluation of Ecophon systems

Add spaces: TheprinciplesofthisstipulationarethoroughlydescribedintheGuidelinesforAirEmissionRegulation(TheDanishEnvironmentalProtectionAgency,1990).

Answer:
The principles of this stipulation are thoroughly described in the Guidelines for Air Emission Regulation (The Danish Environmental Protection Agency, 1990).