Add punctuation: High performing varieties as well as Salix Repens Salix Auritia etc were used
A: High performing varieties, as well as Salix Repens, Salix Auritia, etc. were used.

Add punctuation: Heat Transfer OilHigh Pressure Filter Central heating systems high processing temp Title HTO HP 27108
A: Heat Transfer Oil/High Pressure Filter - Central heating systems & high processing temp. Title: HTO HP 27/108

Add punctuation: My father went in to hospital on March 27th 2000 on April 1st he slipped into a coma from which he never recovered
A:
My father went in to hospital on March 27th 2000 ~ on April 1st he slipped into a coma from which he never recovered.