Simplify the following text for a Grade 14 native English-speaking person.
Original: Controversy surrounded Metcard at its introduction , due to cost over-runs , the abolition of tram conductors and the unreliability of ticket purchasing and validation machines .
Simplified: Controversy surrounded Metcard at its introduction , due to it costing to much , the abolition of tram conductors and the unreliability of ticket purchasing and validation machines .