Complex sentence: The dimension of thermal conductivity is M 1 L 1 T − 3 Θ − 1, expressed in terms of the dimensions mass (M), length (L), time (T), and temperature (Θ).
Split into simpler sentences: The dimension of thermal conductivity is M 1 L 1 T − 3 Θ − 1. These variables are mass (M), length (L), time (T), and temperature (Θ).