Complex sentence: The Philippines is leading this development but it is worrisome that as many as 60% of OFW's are temporary workers are thereby lacking basic rights such as overtime pay, regular breaks or restricted working hours.
Split into simpler sentences: The Philippines is leading this development but it is worrisome that as many as 60% of OFW's are temporary workers. Temporary jobs tend to be excluded from basic labor rights such as overtime pay, regular breaks or restricted working hours.