Complex sentence: The "Luftwaffe" was not able to replace losses and dual use of day fighters for "Wilde Sau" night-fighter operations, amplified this effect and erratic maintenance led to serviceability rates dropping drastically.
Split into simpler sentences: The "Luftwaffe" was not able to replace losses and due to a high attrition rate fighter readiness dwindled. The dual use of day fighters for "Wilde Sau" night-fighter operations amplified this effect and the resulting erratic maintenance schedules led to serviceability rates dropping drastically.