Okay this is my first time using shoptalk and i need help.

this is my 5th year teachign 2nd grade with BJU curriculum and i like it. we just got the Science 2 4th edition and i love love the concepts and how the approach is different. However, it is requiring more critical thinking but i teach in PR where most of my students learnt Elnglish in our school from K5...English is not their first language and many of their parents do not speak English. Therefore, the curriculum is possing to be a challenge and i need ideas on how to teach it in an easier way for the students to uderstand and remember the long terms and definitions...any 2nd grade teacher out there or anyone really...please help