Complex sentence: Wayne LaPierre expressed caution that the NRA has "a lot of work ahead" attempting to overturn other gun control regulations not covered by "McDonald", and Paul Helmke said that he expected that the NRA is "going to lose most of those lawsuits".
Split into simpler sentences: Wayne LaPierre expressed caution that the NRA has "a lot of work ahead" attempting to overturn other gun control regulations not covered by "McDonald". And Paul Helmke said that he expected that the NRA is "going to lose most of those lawsuits".